单项选择题

It is well-known fact that the cat family ______ lions and tigers.

A．enriches
B．accommodates
C．adopts
D．embraces

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单项选择题

______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.

A．As
B．Since
C．Provided
D．While

单项选择题

______,heat is produced.

A．Certain chemicals are mixed together
B．That certain 'chemicals are mixed together
C．Whenever certain chemicals are mixed together
D．The mixing together of certain chemicals

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