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It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.
A、that
B、what
C、when
D、how
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It was a nice house, but _______ too small for a family of live.A. rarely B. fairly C. rather D. pretty
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The newly married couple wants a restaurant that serves good food and has a bit of__________ as well.
A．situation
B．conditions
C．environment
D．atmosphere
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B:believed
C:encountered
D:understood
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B:New
C:Active
D:Pretty
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Which of the following，according to the passage，is a list of three natural sources of radiation？( ) A.Radioactive potassium in bone，strontium 90，uranium ore.
B.Carbon 14 in tissues，cosmic rays，X rays.
C.Cosmic rays，radioactive potassium in bones，radioactive carbon in tissues.
D.X rays，carbon 14，plutonium.
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