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【判断题】
颗粒状吸附剂可用于气态、蒸汽态和气溶胶的采样。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】已知圆锥被切割后的主、俯视图,正确的左视图是 2
【单选题】While others sat at home studying papers on the subject, Jefferson got into a boat and made____observations.
A.
of-the-spot
B.
in-the-spot
C.
on-the-spot
D.
at-the-spot
【单选题】The boys looked for the ball for a while in the playground, but finally gave are went home.
A.
up
B.
out
C.
away
D.
off
【单选题】While Maggie, a white-collar worker, was at home after work, she ______ doing something to doing nothing.
A.
liked
B.
favored
C.
tended
D.
preferred
【单选题】The home ________ the lion is Africa while the koala bear is native ________Australia.
A.
of；of
B.
to；to
C.
of；to
D.
to；of
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