Carbondioxidefromburningfuelsi

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Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.

A．producing	B．having been produced
C．to be produced	D．produced

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They are said to have developed a new ______ to teaching ,_______ is bound to improve classroom teaching greatly.

A．approach; which	B．approach; that
C．means; which	D．means; that

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________ of his son’s safety, the father turned off the light and went to bed.

A．Being convinced	B．Convincing
C．Convinced	D．Having convinced

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We are exited that a satellite ________ 10 tons was successfully placed in orbit yesterday.

A．weighed	B．weighing
C．to be weighed	D．being weighed

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-Can you lend me some more money?
-Sorry,I’ve gotat hand myself.You know the cell phone cost me all I had just now.

A．no

B．not

C．none

D．nothing

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When you stand on the top of the mountain and overlook the surrounding scenery, you will find it is ______ to climb it up with effort.

A．worth	B．worthy
C．possible	D．worthwhile

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