单项选择题

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A) Exciting. C) Positive.
B) Interesting. D) Boring.
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单项选择题
Sometimes the reason that drugs like penicillin are given to animals is to ______. A) cure the iii animals C) help animals to grow B) make animals healthier D) fatten animals
Sometimes the reason that drugs like penicillin are given to animals is to ______.
A) cure the iii animals C) help animals to grow
B) make animals healthier D) fatten animals
单项选择题
The word it in the sentence it will be the first concern of government to place a limit on the birthrate refers to except ______. A) space C) food B) natural resources D) population
The word "it" in the sentence "it will be the first concern of government to place a limit on the birthrate" refers to except ______.
A) space C) food
B) natural resources D) population
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