单项选择题

A. They want to stay at home and do the housework.
B. They do not have enough money.
C. They have too much work and not much free time.
D. They have more freedom than in the past.
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单项选择题
A. Because it’s hard to classify all of the varieties of animals. B. Because their methods of biological research are inadequate. C. Because they have difficulties in getting enough funding for saving the animals. D. Because they are unwilling to make efforts to save every endangered species.
A. Because it’s hard to classify all of the varieties of animals.
B. Because their methods of biological research are inadequate.
C. Because they have difficulties in getting enough funding for saving the animals.
D. Because they are unwilling to make efforts to save every endangered species.
单项选择题
A. The kitchen is too big. B. It’s too noisy.C. There are only two rooms. D. The air conditioning causes a problem.
A. The kitchen is too big.
B. It’s too noisy.
C. There are only two rooms.
D. The air conditioning causes a problem.
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