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单选题

A．The availability of food is more important for species than the availability of space.
B．The amount of environmental resistance in an ecosystem does not change over time.
C．Environmental resistance controls the population size of species in an ecosystem.
D．The population size of most species increases at a constant rate.

参考答案C

解析:暂无解析

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单选题

A．They supplied an additional food source for gypsy moths.
B．They introduced gypsy moths to areas where there had been none.
C．They cleared oak trees from some areas where both animal species lived.
D．They manipulated the numbers of mice and oak's fruits in some areas.

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单选题回答题
Section A
Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear aquestion, you must choose the best answer from the four choices marked A, B, C and D. Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.
Questions 1 to 4 are based on the conversation you have just heard.

A．Narrow down the topic of her article.
B．Read and revise her essay.
C．Provide some facts for her opinion.
D．Give her some advice on writing a paper.

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单选题

A．Keeping her topic focused and supporting her opinions with facts.
B．Reading extensively and collecting as much reference as possible.
C．Avoiding sensitive political points and seeking more power.
D．Having discussions with employees and giving them more freedom.

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