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问题和答案

1801. Arthur A. Lumsdaine
      (Arthur A. Lumsdaine)
1802. Arthur C. Clarke
      (Arthur C. Clarke)
1803. Arthur C. Clarke Award
      (Arthur C. Clarke Award)
1804. Arthur Conan Doyle
      (Arthur Conan Doyle)
1805. Arthur Eddington
      (Arthur Eddington)
1806. Arthur Holmes
      (Arthur Holmes)
1807. Arthur Honegger
      (Arthur Honegger)
1808. Arthur Kornberg
      (Arthur Kornberg)
1809. Arthur Liebehenschel
      (Arthur Liebehenschel)
1810. Arthur Miller
      (Arthur Miller)
1811. Arthur Rubinstein
      (Arthur Rubinstein)
1812. Arthur Wellesley, 1st Duke of Wellington
      (Arthur Wellesley, 1st Duke of Wellington)
1813. Artibonite (department)
      (Artibonite (department))
1814. Artibonite River
      (Artibonite River)
1815. Article (grammar)
      (Article (grammar))
1816. Article Five of the United States Constitution
      (Article Five of the United States Constitution)
1817. Article One of the United States Constitution
      (Article One of the United States Constitution)
1818. Article Seven of the United States Constitution
      (Article Seven of the United States Constitution)
1819. Article Six of the United States Constitution
      (Article Six of the United States Constitution)
1820. Article Three of the United States Constitution
      (Article Three of the United States Constitution)
1821. Article Two of the United States Constitution
      (Article Two of the United States Constitution)
1822. Articles of Confederation
      (Articles of Confederation)
1823. Artificial cranial deformation
      (Artificial cranial deformation)
1824. Artificial intelligence
      (Artificial intelligence)
1825. Artificial neural network
      (Artificial neural network)
1826. Artificial selection
      (Artificial selection)
1827. Artificial sweetener
      (Artificial sweetener)
1828. Artillery
      (Artillery)
1829. Artivism
      (Artivism)
1830. Artpop
      (Artpop)
1831. Arts and crafts
      (Arts and crafts)
1832. Arts et Métiers ParisTech
      (Arts et Métiers ParisTech)
1833. Artur Schnabel
      (Artur Schnabel)
1834. Arturo Toscanini
      (Arturo Toscanini)
1835. Arunachal Pradesh
      (Arunachal Pradesh)
1836. Arupadaiveedu
      (Arupadaiveedu)
1837. Arvada, Colorado
      (Arvada, Colorado)
1838. Aryan
      (Aryan)
1839. Aryan race
      (Aryan race)
1840. As the World Turns
      (As the World Turns)
1841. As Young as You Feel
      (As Young as You Feel)
1842. AS-90
      (AS-90)
1843. Asbestos
      (Asbestos)
1844. Asbestosis
      (Asbestosis)
1845. Asbury Park, New Jersey
      (Asbury Park, New Jersey)
1846. Ascaris
      (Ascaris)
1847. Ascending node
      (Ascending node)
1848. Ascension
      (Ascension)
1849. Ascension Island
      (Ascension Island)
1850. Asceticism
      (Asceticism)
1851. Aschaffenburg (district)
      (Aschaffenburg (district))
1852. ASCII
      (ASCII)
1853. Ascoli Piceno
      (Ascoli Piceno)
1854. Ascorbic acid
      (Ascorbic acid)
1855. Asexual reproduction
      (Asexual reproduction)
1856. Asgard
      (Asgard)
1857. Ash
      (Ash)
1858. Ash tree
      (Ash tree)
1859. Ashanti
      (Ashanti)
1860. Ashanti (entertainer)
      (Ashanti (entertainer))
1861. Ashford Black Marble
      (Ashford Black Marble)
1862. Ashland, Natchitoches Parish, Louisiana
      (Ashland, Natchitoches Parish, Louisiana)
1863. Ashley Tisdale
      (Ashley Tisdale)
1864. Ashmolean Museum
      (Ashmolean Museum)
1865. Ashton Kutcher
      (Ashton Kutcher)
1866. Ashtown Castle
      (Ashtown Castle)
1867. Asia
      (Asia)
1868. Asia Pacific
      (Asia Pacific)
1869. Asiago
      (Asiago)
1870. Asian Americans
      (Asian Americans)
1871. Asiana Airlines Flight 214
      (Asiana Airlines Flight 214)
1872. Asiana Airlines Flight 733
      (Asiana Airlines Flight 733)
1873. Asiatic linsang
      (Asiatic linsang)
1874. Aslak Brekke og visune hans
      (Aslak Brekke og visune hans)
1875. Asperger syndrome
      (Asperger syndrome)
1876. Aspergillus
      (Aspergillus)
1877. Aspergillus flavus
      (Aspergillus flavus)
1878. Aspiration
      (Aspiration)
1879. Aspirator
      (Aspirator)
1880. Aspirin
      (Aspirin)
1881. Assassin bug
      (Assassin bug)
1882. Assassination
      (Assassination)
1883. Assassination of Abraham Lincoln
      (Assassination of Abraham Lincoln)
1884. Assassination of Archduke Franz Ferdinand of Austria
      (Assassination of Archduke Franz Ferdinand of Austria)
1885. Assassination of Martin Luther King Jr.
      (Assassination of Martin Luther King Jr.)
1886. Assembly language
      (Assembly language)
1887. Assembly line
      (Assembly line)
1888. Asset
      (Asset)
1889. Asshole
      (Asshole)
1890. Assisi
      (Assisi)
1891. Assisted suicide
      (Assisted suicide)
1892. Associate Justice of the Supreme Court of the United States
      (Associate Justice of the Supreme Court of the United States)
1893. Associated Board of the Royal Schools of Music
      (Associated Board of the Royal Schools of Music)
1894. Association Aéronautique et Astronautique de France
      (Association Aéronautique et Astronautique de France)
1895. Association football
      (Association football)
1896. Association of Southeast Asian Nations
      (Association of Southeast Asian Nations)
1897. Assyrian calendar
      (Assyrian calendar)
1898. Assyrian genocide
      (Assyrian genocide)
1899. Astarte
      (Astarte)
1900. ASTech
      (ASTech)
1901. Asterisk
      (Asterisk)
1902. Asteroid
      (Asteroid)
1903. Asteroid belt
      (Asteroid belt)
1904. Asteroid impact prediction
      (Asteroid impact prediction)
1905. Asteroid spectral types
      (Asteroid spectral types)
1906. Asthma
      (Asthma)
1907. Astigmatism
      (Astigmatism)
1908. Astley Baker Davies
      (Astley Baker Davies)
1909. Aston University
      (Aston University)
1910. Aston Villa F.C.
      (Aston Villa F.C.)
1911. Astrocyte
      (Astrocyte)
1912. Astrology
      (Astrology)
1913. Astrometry
      (Astrometry)
1914. Astronomer Royal
      (Astronomer Royal)
1915. Astronomical clock
      (Astronomical clock)
1916. Astronomical spectroscopy
      (Astronomical spectroscopy)
1917. Astronomical unit
      (Astronomical unit)
1918. Astronomy
      (Astronomy)
1919. Asura
      (Asura)
1920. Aswan
      (Aswan)
1921. Aswan Low Dam
      (Aswan Low Dam)
1922. Asylum
      (Asylum)
1923. Asylum seeker
      (Asylum seeker)
1924. At bat
      (At bat)
1925. Atacama Region
      (Atacama Region)
1926. Atahualpa
      (Atahualpa)
1927. Atalanta B.C.
      (Atalanta B.C.)
1928. Atari 5200
      (Atari 5200)
1929. Atari Jaguar
      (Atari Jaguar)
1930. Atauro
      (Atauro)
1931. Ataxia
      (Ataxia)
1932. Atchison County, Kansas
      (Atchison County, Kansas)
1933. Atchison, Kansas
      (Atchison, Kansas)
1934. Atchison, Topeka and Santa Fe Railway
      (Atchison, Topeka and Santa Fe Railway)
1935. Atelopus
      (Atelopus)
1936. Aterno-Pescara
      (Aterno-Pescara)
1937. Athanasian Creed
      (Athanasian Creed)
1938. Atheism
      (Atheism)
1939. Athelfrith of Bernicia
      (Athelfrith of Bernicia)
1940. Athelstan
      (Athelstan)
1941. Athelwulf of Wessex
      (Athelwulf of Wessex)
1942. Athena
      (Athena)
1943. Atheris
      (Atheris)
1944. Athletic shoe
      (Athletic shoe)
1945. Atlanta Campaign
      (Atlanta Campaign)
1946. Atlanta United FC
      (Atlanta United FC)
1947. Atlantic Beach, Florida
      (Atlantic Beach, Florida)
1948. Atlantic City, New Jersey
      (Atlantic City, New Jersey)
1949. Atlantic cod
      (Atlantic cod)
1950. Atlantic Hockey
      (Atlantic Hockey)
1951. Atlantic Ocean
      (Atlantic Ocean)
1952. Atlantic sailfish
      (Atlantic sailfish)
1953. Atlantic salmon
      (Atlantic salmon)
1954. Atlantic slave trade
      (Atlantic slave trade)
1955. Atlantic Sun Conference
      (Atlantic Sun Conference)
1956. Atlas (missile)
      (Atlas (missile))
1957. Atlas Cedar
      (Atlas Cedar)
1958. Atlas V
      (Atlas V)
1959. Atmel AVR
      (Atmel AVR)
1960. Atmosphere of Earth
      (Atmosphere of Earth)
1961. Atmosphere of Mars
      (Atmosphere of Mars)
1962. Atmospheric chemistry
      (Atmospheric chemistry)
1963. Atmospheric circulation
      (Atmospheric circulation)
1964. Atoll
      (Atoll)
1965. Atom
      (Atom)
1966. Atomic Betty
      (Atomic Betty)
1967. Atomic bombings of Hiroshima and Nagasaki
      (Atomic bombings of Hiroshima and Nagasaki)
1968. Atomic Energy Commission
      (Atomic Energy Commission)
1969. Atomic force microscope
      (Atomic force microscope)
1970. Atomic mass
      (Atomic mass)
1971. Atomic nucleus
      (Atomic nucleus)
1972. Atomic orbital
      (Atomic orbital)
1973. Atomic physics
      (Atomic physics)
1974. Atomic radius
      (Atomic radius)
1975. Atomic theory
      (Atomic theory)
1976. Atomkraft
      (Atomkraft)
1977. Atrax
      (Atrax)
1978. Atreyu
      (Atreyu)
1979. Atropatene
      (Atropatene)
1980. Atropates
      (Atropates)
1981. Attack on Pearl Harbor
      (Attack on Pearl Harbor)
1982. Attacks by Islamic extremists in Bangladesh
      (Attacks by Islamic extremists in Bangladesh)
1983. Attention-deficit hyperactivity disorder
      (Attention-deficit hyperactivity disorder)
1984. Attica
      (Attica)
1985. Atticus Finch
      (Atticus Finch)
1986. Attila the Hun
      (Attila the Hun)
1987. Attrition warfare
      (Attrition warfare)
1988. Aubrey Brain
      (Aubrey Brain)
1989. Auburn, Alabama
      (Auburn, Alabama)
1990. Auch
      (Auch)
1991. Auckland Grammar School
      (Auckland Grammar School)
1992. Auction
      (Auction)
1993. Aude (river)
      (Aude (river))
1994. Audi Cup
      (Audi Cup)
1995. Audio engineer
      (Audio engineer)
1996. Audiophile
      (Audiophile)
1997. Audit
      (Audit)
1998. Auditorium
      (Auditorium)
1999. Auditory hallucination
      (Auditory hallucination)
2000. Audrey Rose
      (Audrey Rose)
2001. Audrey Tautou
      (Audrey Tautou)
2002. Augsburg (district)
      (Augsburg (district))
2003. August
      (August)
2004. August Ferdinand Möbius
      (August Ferdinand Möbius)
2005. Augustana
      (Augustana)
2006. Augustana College (Illinois)
      (Augustana College (Illinois))
2007. Auguste Comte
      (Auguste Comte)
2008. Auguste Escoffier
      (Auguste Escoffier)
2009. Auguste Rodin
      (Auguste Rodin)
2010. Auhausen
      (Auhausen)
2011. Aularches miliaris
      (Aularches miliaris)
2012. Aum Shinrikyo
      (Aum Shinrikyo)
2013. Aung San Suu Kyi
      (Aung San Suu Kyi)
2014. Aura (symptom)
      (Aura (symptom))
2015. Aurigny Air Services
      (Aurigny Air Services)
2016. Aurochs
      (Aurochs)
2017. Aurora
      (Aurora)
2018. Aurora (mythology)
      (Aurora (mythology))
2019. Aurornis
      (Aurornis)
2020. Auschwitz concentration camp
      (Auschwitz concentration camp)
2021. Austen Chamberlain
      (Austen Chamberlain)
2022. Austerity
      (Austerity)
2023. Austin & Ally
      (Austin & Ally)
2024. Austin Motor Company
      (Austin Motor Company)
2025. Austin Powers (character)
      (Austin Powers (character))
2026. Austin, Texas
      (Austin, Texas)
2027. Australasian ecozone
      (Australasian ecozone)
2028. Australia
      (Australia)
2029. Australia at the 2018 Winter Paralympics
      (Australia at the 2018 Winter Paralympics)
2030. Australia at the Olympics
      (Australia at the Olympics)
2031. Australia Day
      (Australia Day)
2032. Australia national cricket team
      (Australia national cricket team)
2033. Australia national football team
      (Australia national football team)
2034. Australian Aboriginal astronomy
      (Australian Aboriginal astronomy)
2035. Australian Aboriginal mythology
      (Australian Aboriginal mythology)
2036. Australian Broadcasting Corporation
      (Australian Broadcasting Corporation)
2037. Australian Bureau of Statistics
      (Australian Bureau of Statistics)
2038. Australian cinema
      (Australian cinema)
2039. Australian Convict Sites
      (Australian Convict Sites)
2040. Australian country music
      (Australian country music)
2041. Australian Defence Force
      (Australian Defence Force)
2042. Australian dollar
      (Australian dollar)
2043. Australian Electoral Commission
      (Australian Electoral Commission)
2044. Australian Football League
      (Australian Football League)
2045. Australian Fossil Mammal Sites (Riversleigh)
      (Australian Fossil Mammal Sites (Riversleigh))
2046. Australian gold rush
      (Australian gold rush)
2047. Australian green tree frog
      (Australian green tree frog)
2048. Australian impact structure
      (Australian impact structure)
2049. Australian Kelpie
      (Australian Kelpie)
2050. Australian Labor Party
      (Australian Labor Party)
2051. Australian Labor Party (Anti-Communist)
      (Australian Labor Party (Anti-Communist))
2052. Australian Labor Party (NSW)
      (Australian Labor Party (NSW))
2053. Australian megafauna
      (Australian megafauna)
2054. Australian Mist
      (Australian Mist)
2055. Australian Music Prize
      (Australian Music Prize)
2056. Australian National Botanic Gardens
      (Australian National Botanic Gardens)
2057. Australian Overland Telegraph Line
      (Australian Overland Telegraph Line)
2058. Australian Plains
      (Australian Plains)
2059. Australian pound
      (Australian pound)
2060. Australian War Memorial
      (Australian War Memorial)
2061. Australopithecine
      (Australopithecine)
2062. Australopithecus
      (Australopithecus)
2063. Australopithecus africanus
      (Australopithecus africanus)
2064. Australopithecus anamensis
      (Australopithecus anamensis)
2065. Australovenator
      (Australovenator)
2066. Austria
      (Austria)
2067. Austria at the 2018 Winter Paralympics
      (Austria at the 2018 Winter Paralympics)
2068. Austria-Hungary
      (Austria-Hungary)
2069. Austrian Airlines
      (Austrian Airlines)
2070. Austrian Football Bundesliga
      (Austrian Football Bundesliga)
2071. Austrian Grand Prix
      (Austrian Grand Prix)
2072. Austrian Regional League Central
      (Austrian Regional League Central)
2073. Austrian Regional League East
      (Austrian Regional League East)
2074. Austrian Regional League West
      (Austrian Regional League West)
2075. Austrian School
      (Austrian School)
2076. Austro-Bavarian language
      (Austro-Bavarian language)
2077. Authority
      (Authority)
2078. Autism
      (Autism)
2079. Autism rights movement
      (Autism rights movement)
2080. Auto Club Speedway
      (Auto Club Speedway)
2081. Auto-Tune
      (Auto-Tune)
2082. Autobahn
      (Autobahn)
2083. Autobiography of Mark Twain
      (Autobiography of Mark Twain)
2084. Autodefensas Unidas de Colombia
      (Autodefensas Unidas de Colombia)
2085. Autodromo Enzo e Dino Ferrari
      (Autodromo Enzo e Dino Ferrari)
2086. Autódromo José Carlos Pace
      (Autódromo José Carlos Pace)
2087. Autofocus
      (Autofocus)
2088. Autoimmunity
      (Autoimmunity)
2089. AutoIt
      (AutoIt)
2090. Autolycus of Pitane
      (Autolycus of Pitane)
2091. Automated external defibrillator
      (Automated external defibrillator)
2092. Automated teller machine
      (Automated teller machine)
2093. Automatic rifle
      (Automatic rifle)
2094. Automation
      (Automation)
2095. Automaton
      (Automaton)
2096. Automeris io
      (Automeris io)
2097. Automobili Turismo e Sport
      (Automobili Turismo e Sport)
2098. Automotive lighting
      (Automotive lighting)
2099. Autonomous communities of Spain
      (Autonomous communities of Spain)
2100. Autonomous Province of Kosovo and Metohija
      (Autonomous Province of Kosovo and Metohija)