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问题 选择题

“观察DNA、RNA在细胞中的分布”的实验中，下列正确的实验步骤是：[ ]

A．水解→制片→冲洗→染色→观察

B．制片→水解→染色→冲洗→观察

C．制片→染色→水解→冲洗→观察

D．制片→水解→冲洗→染色→观察

答案

答案：D

选择题

When I talked with my grandma on the phone, she sounded weak, but by the time we ________up, her voice had been full of life.

A．were hanging

B．had hung

C．hung

D．would hang
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选择题

The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.

A．which; what

B．through which; what

C．through that; what

D．what; that
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