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发布时间: 1970-01-01

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1最佳选择题 3分

Non-indigenousnon-nativespeciesofplantsandanimalsa

  • A. Human factors affect its rates more than its long-term amount.
  • B. Natural expansions of species account for their slow contractions.
  • C. Natural environments created by humans facilitate species movement.
  • D. Long-range species movement relies on the ranges of man’’s mobility.
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本题解析: 暂无解析

2最佳选择题 3分

Non-indigenousnon-nativespeciesofplantsandanimalsa

  • A. is liable for the fast distribution of the Russian wheat pest.
  • B. failed to isolate the Russian wheat aphid in limited locales.
  • C. provides data about foreign species imported by regulated routes.
  • D. is responsible for introducing harmful plants onto federal lands.
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3最佳选择题 3分

Non-indigenousnon-nativespeciesofplantsandanimalsa

  • A. To explain the difficulties in tracing the pathways for long-established species.
  • B. To describe the events leading to the detection of non-indigenous species.
  • C. To identify the problems in assessing the weight of entry tracks for foreign species.
  • D. To discuss the role of time lags and geographic expansion in species detection.
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4最佳选择题 3分

Non-indigenousnon-nativespeciesofplantsandanimalsa

  • A. earth fertility.
  • B. import restrictions.
  • C. natural obstacles.
  • D. fire disasters.
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5最佳选择题 3分

Non-indigenousnon-nativespeciesofplantsandanimalsa

  • A. whether the species is considered to be a pest.
  • B. whether the species enters by a closely-checked route.
  • C. the rate at which the species extends geographically.
  • D. the magnitude of the average number of the species.
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