单项选择题

Dry farming is a type of agriculture used in areas______less than 20 inches of rainfall．

A．there are
B．where there is
C．in which is
D．which has
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单项选择题
Not until 1942______a drying patient’s life using penicillin．
A．when John Bumstead and Orvan Hess saved
B．saved John Bumstead and Orvan Hess
C．did John Bumstead and Orvan Hess save
D．that John Bumstead and Orvan Hess
单项选择题
When I was a teenager，I______a lot and people couldn’t understand what I was saying．
A．complained
B．mumbled
C．uttered
D．gossiped
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