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第1题

The old told me that it was no use thinking too much about one’s _____ youth. A.loss B.losing C.lose D.lost
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第2题

定轴轮系的总传动比等于各级传动比（ ）。(本题2.0分) A、 之和 B、 连乘积 C、 之差 D、 平方和
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第3题

Mr. Brown had hardly said a word since supper, _____ had his wife. A.either B.or C.nor D.so
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第4题

The workers in the factory stopped working in（）against their foreman using bad language. A.protest B.threat C.conflic
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