题目内容

【C13】

A. since
B. once
C. when
D. while

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The word it in the passage refers to

A. ice
B. soil
C. moon
D. solar system

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All of the following are cited as reasons why civilizations developed EXCEPT

A. Religious practices unified the population.
B. The management of water required organization.
C. A major climate change made living in groups necessary.
D. Extra food resulted in the expansion of population centers.

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A．profitableB．voluntaryC．accidentalD．compulsory

A. profitable
B. voluntary
C. accidental
D. compulsory

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D.The relationship between a parasite and a host will evolve over time. The word tolerate in the passage is closest in meaning to

A. permit
B. oppose
C. profit
D. avoid

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【C13】

A. since B. once C. when D. while

The word it in the passage refers to

All of the following are cited as reasons why civilizations developed EXCEPT

A．profitableB．voluntaryC．accidentalD．compulsory

D.The relationship between a parasite and a host will evolve over time. The word tolerate in the passage is closest in meaning to

A. since
B. once
C. when
D. while