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..
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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.
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A. until
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B. unless
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C. since
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D. but
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3. When First Lady Michel appeared in Peking University, all the students couldn’t
control their_______ feelings and cheered up.
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A. excite
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B. exciting
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C. excited
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D. excitement
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