Theyareputtingtoomuchcarbondio

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They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.

A．what

B．that

C．which

D．who

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In order to find the missing child, villagers all they can over the past five hours.

A．did	B．do
C．had done	D．have been doing

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The head of the company promised to deal with matters of this sort he returned to his office.

A．until	B．while
C．at the time	D．the moment

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A．The; the	B．/; the
C．A; the	D．a; a

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—rapid progress they have made!
— Right. And it is true the students from other developing countries.

A．What a; with	B．How a; for
C．How; of	D．What; of

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The plane is flying ____ a speed of 500 kilometers an hour ____ the way to Kunming.

A．with; on	B．at; on
C．at; in	D．with; in

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