15．It's already tens of years____the world's population reached five billion．（　�。�
A．beforeB．afterC．since

分析 自從世界人口達(dá)到50億已經(jīng)幾十年了．

解答 答案：C；
根據(jù)設(shè)空處前面的It's already tens of years，聯(lián)系語境可以推測句意是"自從世界人口達(dá)到50億已經(jīng)幾十年了．"表示"自從"用since；故選C．

點(diǎn)評 平時(shí)學(xué)習(xí)過程中，掌握連詞的意思，及所表示的關(guān)系是至關(guān)重要的，這種關(guān)系的判斷可以通過句子意思的理解來選擇恰到的連詞．

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