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．We can never expect _________ bluer sky unless we create _________ less polluted world.

A．a；a	B．a；the
C．the；a	D．the；the

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相关试题

33. E-mail, as well as telephones, ____ an important part in daily communication.

A．is playing

B．have played

C．are playing

D．play

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31. I was just about to go to bed last night ______ the telephone rang.

A．while

B．when

C．as

D．before

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30. The world is ______ seven continents and four oceans.

A．made up of

B．make out of

C．made from

D．made in

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25. ---You’ve missed such a good chance. ---Yes, I that job the boss offered me.

A．must have taken

B．must take

C．should have taken

D．should take

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23. He is always full of ______ as if he never knew tiredness.

A．strength

B．spirit

C．force

D．energy

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