题目内容

____(消磨时间), the man steps into one of the airport cocktail bars and orders a scotch and water.

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He is pleased to have said “lifted”, thinking it sounds more worldly than stole or took or even ____(偷).

Ahead of him the brunette disappears around a corner and in the same moment a young man in a marine uniform puts out a foot to____(绊倒) .

DNA化学检测实验中正确的步骤是( )

A. 取材制片-水解-冲洗-染色-观察
B. 取材制片-染色-冲洗-水解-观察
C. 取材制片-水解-染色-冲洗-观察
D. 取材制片-冲洗-水解-染色-观察

染色质的化学组成是（）

A. DNA，RNA，组蛋白及非组蛋白
B. DNA，组蛋白及非组蛋白
C. DNA RNA及组蛋白
DNA及组蛋白