China’s population is expected to increase to about 1.5 billion in 2040, _____ it will start to decline slowly.
A．whereB．whichC．a(chǎn)fter whichD．on which
C

試題分析：情景對話 句意為：中國的人口有望在2014年增長到15億左右。此后，人口增長速度將會減慢
定語從句可分為限制性和非限制性定語從句。此題顯然屬于非限制性定語從句，關(guān)系詞的選擇就成為關(guān)鍵。介詞+which或whom=關(guān)系副詞 從功能上將，A,C,D歸為一類，B為第二類。又從句中缺狀語，故排除B選項(xiàng)。講第一類細(xì)分，C和D在功能上一致，相當(dāng)于when，不過意義上有區(qū)別。B選項(xiàng)充當(dāng)?shù)攸c(diǎn)狀語。根據(jù)句意，可排除B。C和D的區(qū)別在介詞上，確定介詞的方式就是和前面的名詞（現(xiàn)行詞）進(jìn)行搭配。以此題為例，after which 在2040之后，on which 在2040這一年，顯然C符合題意
點(diǎn)評：此題主要考察考生對定語從句關(guān)系詞的掌握程度和熟練情況，此類型題，考生應(yīng)該將選擇枝做出對比，按關(guān)聯(lián)性原則將選項(xiàng)歸類，詳見解析。
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