【題目】---The numbers of some kinds of sharks _____ really quickly in the last 20 to 30 years

---Yes, the government should develop laws to stop the sale of shark fins.

A. fellB. fall

C. have fallenD. are falling

【答案】C

【解析】

本題考查：現(xiàn)在完成時。選項fall落下；變成；來臨；減弱。綜合分析前后句， 可知此處填 have fallen最合適，依據(jù)in the last 20 to 30 years在過去的20到30年里，是持續(xù)的一段時間，故用現(xiàn)在完成時。完整句意為：The numbers of some kinds of sharks have fallen really quickly in the last 20 to 30 years在過去的20到30年里，一些種類的鯊魚的數(shù)量急劇下降Yes, the government should develop laws to stop the sale of shark fins.是的，政府應該制定法律來阻止魚翅的銷售。正確答案為：C

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