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【单选题】
镁带在CO 2 中燃烧的反应为2Mg＋CO 2 2MgO＋C则下列叙述中错误的是 [ ]A.
CO 2 具有氧化性，镁带有还原性
B.
物质只有跟氧气接触，燃烧
C.
这是一个置换反应
D.
镁带着火，不能用二氧化碳灭
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举一反三
【单选题】The traffic was _________when the car accident happened .
A.
held up
B.
held out
C.
held on
D.
held down
【单选题】In my opinion, being impatient is______ with being a good teacher.
A.
intrinsic
B.
ingenious
C.
incompatible
D.
inherent
【单选题】The traffic was held __________ by an accident for two hours.
A.
on
B.
out
C.
to
D.
up
【单选题】The reason ( ) he was late for the meeting was ( ) he was held up by the traffic jam during rush hours.
A.
why; because
B.
which; that
C.
why; that
D.
that; because
【简答题】阅读理解。 Being a youth is one thing, and being a good one is another. A good youth should have these qualities (品德): First of all, health. A healthy body is the best riches. Without it, nothing can be do...
【简答题】Being impatient is ________ with being a good teacher. A) intrinsic B) ingenious C) incompatible D) inherent
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