题目内容

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

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

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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。( )

TheY decided to chase the cow away__________ it did more damage．

A. unless
B. until
C. before
D. Mthough

The word“collected”in the third paragraph probably means

A. calm
B. attractive
C. leisurely
D. selected