【題目】Sharks are at the top of the food chain, _______ if their numbers drop, the ocean’s ecosystem will be in danger.

A. but B. although C. so D. when

【答案】C

【解析】句意:鯊魚位于食物鏈的上部分,所以如果它們的數(shù)量下降了,整個海洋生態(tài)系統(tǒng)將處于危險之中。but但是,表示轉(zhuǎn)折;although盡管,雖然;so因此,所以;when 時候。根據(jù)句意可知,前后是因果關系所以用so. 故選 C.

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