单项选择题

(Low-level) cumulus clouds, mid-level altostratus clouds, and high-altitude cirrus clouds all (conveys) (information about) (their) atmospheric realms.（）

A.Low-level
B.conveys
C.information about
D.their

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单项选择题

The professor may give extra attention outside of class to a student in need of help but probably will not treat him or her differently when it comes to evaluating school work.（）

A．commenting
B．assigning
C．commanding
D．checking

单项选择题

They are confronting tremendous and more complicated problems.（）

A．discussing
B．solving
C．undertaking
D．facing

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