单项选择题

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitude.
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单项选择题
According to the passage, dwindle means ________.
A．decrease
B．enlarge
C．weaken
D．eliminate
单项选择题
A．They have difficulty identifying these cells.B．They aren’’t sure how these cells work.C．They’’ve learned how to reproduce these cells.D．They’’ve found similar cells in other species.
A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
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