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Scientists in Canada say big ocean fish have almost disappeared from the world since the start of industrial fishing in the nineteen-fifties. The scientists found that population of large fish like tuna; swordfish and cod have dropped by ninety percent in the past fifty years.
The study took ten years. The researchers gathered records from fishing businesses and governments around the world. The magazine Nature published the findings.
The scientists say the common method called longline fishing is especially damaging to populations of large fish. This method involves many fishing lines connected to one boat. These wires can be close to one-hundred kilometers long. They hold thousands of sharp metal hooks to catch fish.
Longline fishing is especially common in the Japanese fishing industry. Records showed that Japanese boats used to catch about ten fish for every one-hundred hooks. The study says longline fishing boats now might catch one fish per hundred hooks.
The scientists say industrial fishing can destroy groups of fish much faster than in the past. The study suggests that whole populations can disappear almost completely from new fishing areas within ten to fifteen years.
Ransom Myers of Dalhousie University in Nova Scotia led the study with Boris Worm of Dalhousie and the University of Kiel in Germany. Mister Worm says the destruction could lead to a complete re-organization of ocean life systems. Mister Meyers says the decreased number of large fish is not the only worry. He says even populations that are able to reproduce do not get the chance to live long enough to grow as big as their ancestors(祖先). He says not only are there fewer big fish, they are smaller than those of the past.
American government scientists say even with the best efforts to protect fish populations, decreases are to be expected.
小題1:Where is the passage probably taken from?
A．A story book.
B．A business magazine.
C．An environment report.
D．An economic survey.
小題2:Big fish have gradually been disappearing especially because ________.
A．longline fishing method is used
B．sea water is getting polluted
C．mankind destroys the environment
D．governments don’t make the best efforts
小題3:Which of the following shows the fact that the populations of large fish have dropped?
A．Today’s “l(fā)arge”fish are smaller than those of the past.
B．Longline boats now might catch fewer fish every one-hundred hooks.
C．Fish even able to reproduce don’t have the chance to live longer.
D．Japanese boats could catch about ten fish for every 100 hooks.
小題4:What can be the best title?
A．Discoveries Canadian Scientists Have Made
B．Japanese Fishing Industry
C．Losses of Big Fish
D．Modern Fishing Methods
小題5:When did the researchers begin to survey the decreasing of large fish?
A．In the 1960s.B．In the 1970s.C．In the 1980s.D．In the 1990s.

小題1:C
小題2:A
小題3:D
小題4:C
小題5:D
文章主要討論的就是大型魚類的消失的原因
小題1:C 推理題。本文是關于海洋中大型魚類越來越少，說明這是一個關于野生動物環(huán)境報告。
小題2:A 細節(jié)題。根據第三段1,2行The scientists say the common method called longline fishing is especially damaging to populations of large fish.可知A正確。
小題3:D 細節(jié)題。根據第四段2,3行Japanese boats used to catch about ten fish for every one-hundred hooks. The study says longline fishing boats now might catch one fish per hundred hooks.可知D正確。
小題4:C 主旨大意題。文章主要討論的就是大型魚類的消失的原因，故C正確。
小題5:D 計算題。根據第二段The study took ten years.現在里現在10多年，那么應該是在20世紀90年代開始的，故D正確。
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D．Educators didn’t agree with the author.
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D．make some students ignore the important works of literature
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