第Ⅰ卷(客观题 共50分)
一、单项填空 在A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。(本大题共14小题,每小题1分,共14分)
1. We can have______ blue sky if we create______ less polluted world..
A. a; a
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B.a; the
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C. the; a
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D. the; the
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2. —Your aunt often walks the dog in the morning. Yeah, ____ bad weather stops her.
A. until
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B. unless
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C. since
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D. but
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