Ifwenowtoprotecttheenvironment

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If we ____ now to protect the environment, we will live to regret it.

A．hadn’t acted	B．haven’t acted
C．don’t act	D．won’t act

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When I went to the lake, my father was__________ fishing.

A．putting on

B．taking on

C．concentrating on

D．getting on

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He is always full of __________ as though he has neverknown tiredness.

A．strength

B．energy

C．force

D．spirit

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At present we have no __________ of life on otherplanets.

A．entrance

B．evidence

C．decision

D．suggestion

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This book __________ ten units，__________ three main revision.

A．contains ； including

B．includes ； containing

C．contains ； containing

D．includes ； including

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—I think arts are more interesting than science ones. —__________. I prefer science subjects.

A．It's up to you

B．That's all right

C．I can't agree more

D．I don't think so

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