皮皮学，免费搜题
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【单选题】
在耻骨联合上方能触到时的妊娠为A.
6
B.
8
C.
10
D.
12 E14
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皮皮学刷刷变学霸
举一反三
【单选题】The scientists are studying the effects of human activities______the environment.
A.
in
B.
at
C.
on
D.
with
【单选题】The world's population is getting larger and larger, so the scientists are trying to new ways to solve the food problem. [ ]
A.
devote to
B.
pay for
C.
come up with
D.
catch up with
【单选题】The scientists are able to ____________ accurately when the spaceship will reach the moon.
A.
accumulate
B.
calculate
C.
appoint
D.
estimate
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