题目内容

Translate the following sentences into English, using the words or expressions given in the brackets:你能匀出一张票子给我吗？(to spare)

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Translate the following sentences into English, using the words or expressions given in the brackets:那个上了年纪的灰头发的人是铜匠。(by trade)

Match each of the following words with the corresponding meaning.

I. 词语填空（请根据首字母提示，用本单元新学词语的适当形式填空）I had trouble understanding the French, so I got the English v ________ of the book from the library.

下列哪一项不属于内源基因的变异

A. 基因扩增
B. 基因表达异常
C. 病原体基因侵入体内
D. 基因重排
E. 点突变