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【题目】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:鲨鱼位于食物链的上部分,所以如果它们的数量下降了,整个海洋生态系统将处于危险之中。but但是,表示转折;although尽管,虽然;so因此,所以;when 时候。根据句意可知,前后是因果关系所以用so. 故选 C.

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