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发布时间: 1970-01-01

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1最佳选择题 3分

Theextinctionoflargeprehistoricanimalsisnotedtosug

  • A. large animal were vulnerable to the changing environment
  • B. small species survived as large animals disappeared
  • C. large sea animals may face the same threat today
  • D. slow - growing fish outlive fast - growing ones
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本题解析: 暂无解析

2最佳选择题 3分

WecaninferfromDrMyersandDr.Worm'spaperthat______.

  • A. the stock of large predators in some old fisheries has reduced by 90%
  • B. there are only half as many fisheries as there were 15 years ago
  • C. the catch sizes in new fisheries are only 20% of the original amount
  • D. the number of larger predators dropped faster in new fisheries than in the old
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本题解析: 暂无解析

3最佳选择题 3分

BysayingthesefiguresareconservativeLine1Paragraph3

  • A. fishing technology has improved rapidly
  • B. the catch- sizes are actually smaller than recorded
  • C. the marine biomass has suffered a greater loss
  • D. the data collected so far are out of date
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本题解析: 暂无解析

4最佳选择题 3分

DrMyersandotherresearchersholdthat______.

  • A. people should look for a baseline that can't work for a longer time
  • B. fisheries should keep the yield below 50% of the biomass
  • C. the ocean biomass should restore its original level
  • D. people should adjust the fishing baseline to changing situation
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本题解析: 暂无解析

5最佳选择题 3分

Theauthorseemstobemainlyconcernedwithmostfisheries

  • A. management efficiency
  • B. biomass level
  • C. catch - size limits
  • D. technological application
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本题解析: 暂无解析

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