题目内容

This passage is mainly about______.

A. the streets and the city transportation in ancient Rome
B. the living conditions of ordinary people in ancient Rome
C. the beautiful building in ancient Rome
D. the food and daily supplies in ancient Rome

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【B20】

A. them
B. theirs
C. their
D. they

If you feel faint, it is best to______.

A. run about
B. lie flat
C. move slowly
D. stand up

有4名学生参加数，理，化三科竞赛，每人限报一科，则不同的报名情况有()种．

A. 34
B. 43
C. 321
D. 432
E. 241

若改变处理血影的离子强度。则血影蛋白和肌动蛋白条带消失，说明这两种蛋白不是内在膜蛋白。

A. 正确
B. 错误