题目内容

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

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

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The word“collected”in the third paragraph probably means

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

染色体制片，最好是取植物的茎尖为材料。( )

植物细胞分裂最普遍的方式是有丝分裂和无丝分裂。( )

The proposal that business companies__________ guided by professionals for their new scheme of developments was accepted without disagreement．

A. be
B. are
C. was
D. were