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第1题

2. Mary is keen on ( ) conjuring tricks.　 (A) perform (B) being performed (C) performing (D) performed
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第2题

1. _____all the representatives still not there,the meeting was postponed for several hours.　 (A) Because (B) With
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第3题

4、齿轮泵产生泄漏的间隙为 间隙和 间隙，此外还存在 间隙，其中 泄漏占总泄漏量的80%～85%。
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第4题

3[填空题,20分] International trade-the exchange of goods and services 1 borders is often explained by the theory of comp
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