题目内容

I wonderon sale.

A. how much cost these shoes
B. how much do these shoes cost
C. how much these shoes cost
D. how much are these shoes cost

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We have already built two tunnelswe can get across the big river.

A. which
B. on which
C. by which
D. through which

I don’t regret__________ her what I thought,even if it upset her.

A. to tell
B. telling
C. tell
D. told

Einstein’s__________of relativity explains the motion of moving objects.

A. idea
B. concept
C. theory
D. thiriking

植物细胞、组织和器官在适当的条件下离体培养,最终能形成新的植株的理论基础是植物细胞具有全能性。( )

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