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第1题

化合物中只有一个羰基,却在1773cm-1和1736cm-1处出现两个吸收峰这是因为:( )< img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examinati
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第2题

We can not trust him any more because he often ________ his duty. 　A) owes B) spoils C) deserts
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第3题

The newspaper didn’t mention the ___ of the damage caused by the fire. A) range B) level C) extent D) quantity
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第4题

The Smiths decided to _____ a boy and a girl though they already had three children. A) adapt B) bring C) receive D) a
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