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)
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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
病源体基因侵入人体主要引起哪种疾病
A. 遗传病
B. 肿瘤
C. 传染病
D. 高血压
E. 心血管疾病
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