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单选题 英语六级
2016-11-06

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.
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参考答案

C

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1
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2 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.        
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D．Give her some advice on writing a paper.
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3
A．Keeping her topic focused and supporting her opinions with facts.
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D．Having discussions with employees and giving them more freedom.
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