—How dangerous it was ! —Yes, but for the passerbys quick action, the girl.
A. was drowned
B. would have been drowned
C. had drowned
D. should be drowned
临床生化实验室用水一般采用
A. 一级水
B. 二级水
C. 三级水
D. 四级水
E. 五级水
受体菌直接摄取供体菌提供的游离DNA片段整合重组，使受体菌的性状发生变异的过程是
A. 转化
B. 转导
C. 接合
D. 溶原性转换
E. 原生质体融合
The weather in London is so changeable that people always take their umbrellas with themrain.
A. for fear of
B. in need of
C. in spite of
D. because of
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