题目内容

The last half of the nineteenth century () the steady improvement in the means of travel.

A. has witnessed
B. was witnessed
C. witnessed
D. is witnessed

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输血相关性传染病不包括

A. 巨细胞病毒感染 B．疟疾
B. 乙型肝炎
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A. cursed
B. echoed
C. bounced
D. hailed

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A. in which
B. for whom
C. with which
D. of whom

受体菌直接摄取游离的DNA而获得新的性状的过程称为

A. 转化
B. 转导
C. 接合
D. 原生质体融合E．溶原性转换