搜题
王老师:19139051760(拨打)
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第1题

Chances are that ______ will survive in case of a fire if it really breaks out some day.
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第2题

If you can not get away ______ yourself, it is of great importance to hang something out of the window to attract atte
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第3题

Cover your mouth ______ a wet towel or cloth, and avoid getting into the smoke.
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第4题

The majority of the u.s population is of European _______.
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