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【单选题】
已知乙烯能被酸性高锰酸钾溶液氧化成CO 2 。既可以用来鉴别乙烷和乙烯，又可以用来除去乙烷中混有的乙烯的方法是（ ）A.
通入足量溴水中
B.
在空气中燃烧
C.
通入酸性高锰酸钾溶液中
D.
与足量的氢气反应
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【单选题】甲物体以乙物体为参考系是静止的,甲物体以丙物体为参考系是运动的,那么以乙物体为参考系,丙是()
A.
一定是静止的
B.
一定是运动的
C.
有可能是静止的或运动的
D.
无法判断
【单选题】— Why not do your homework for a while? — _____ There's too much homework today. Let's finish it first. [ ]
A.
I'm afraid that's not a good idea.
B.
What a good idea!
C.
Great.
D.
Thank you.
【单选题】甲物体以乙物体为参考系是静止的,甲物体以丙物体为参考系是运动的,那么以乙物体为参考系,丙物 体( )
A.
一定是静止的
B.
一定是运动的
C.
可能是运动的，也可能是静止的
D.
无法判断
【单选题】Your advice would be _________ valuable to him, who is now at a loss as to what to do first.
A.
exceedingly
B.
excessively
C.
extensively
D.
exclusively
【单选题】Why does the author suggest that you try your perfume or cologne out on somebody else first?
A.
It may make your date uncomfortable.
B.
It may make you feel sick.
C.
It may have been out-of-date.
D.
It may ruin your dinner.
【简答题】talk to your classmate(s) about how you should avoid doing things that appear to be pleasant at first but will turn out to be really harmful. You may talk about drug abuse, smoking, alcoholism, addict...
【单选题】甲物体以乙物体为参考系是静止的，甲物体以丙物体为参考系是运动的。那么以乙物体为参考系，丙物体运动是（）
A.
一定是静止的
B.
一定是运动的
C.
可能是静止的，也可能是运动的
D.
无法判断
【单选题】You have made a few spelling mistakes in your composition but ________, it's well written. [ ]
A.
first of all
B.
on the whole
C.
on the other hand
D.
after all
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