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题目材料:

Which of the following, if true, would most strengthen the explanations given for aphid population explosions?
  • AWhen a pesticide that affects both aphids and predators is applied to a field, once the pesticide washes away there is an aphid population explosion
  • BInsect predators of aphids can survive for long periods without food as long as the weather remains cold
  • CWhen weather is unusually cold in the spring certain crops grow more abundantly in the following summer increasing the food supply for aphids.
  • DThe predators of aphids can die from causes other than starvation such as disease and severe weather.
  • EAphids can reproduce very quickly if they have sufficient food.

E显示答案

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