— What's your mother doing? — She is ______________. [ ]
A.
cooking
B.
cooks
C.
cook
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参考答案:
举一反三
【单选题】According to the passage, which of the following statements best describes the relationship between secondary atmospheric circulations and jet streams?
A.
Jet streams and baroclinic waves tend to interact most intensely with one another in the winter, then act independently in the summer.
B.
Jet streams and baroclinic waves tend to exist at various points in the atmosphere in inversely proportional strength.
C.
Jet streams and baroclinic waves may behave differently, but they issue from a common source and augment one another.
D.
Jet streams tend to distribute kinetic energy in the atmosphere, and baroclinic waves relay this energy back to the jet stream.
E.
Jet streams tend to be more affected by the presence of landmasses than do haroclinic waves.