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【单选题】
2008年9月25日至28日我国成功发射和收回神七。实现了中国历史上宇航员第一次太空漫步，这标志着我国的航空航天技术又向前迈进了一大步。在飞船的第一、二级发动机中，所用的燃料其中之一就是四氧化二氮。下列叙述中不正确的是 [ ]A.
四氧化二氮是由6个元素构成的
B.
四氧化二氮的相对分子质量是92
C.
四氧化二氮由氮、氧两种元素组成
D.
四氧化二氮分子中氮、氧原子的个数比为1:2
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【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
To persuade Mary to spend more time on her lessons.
B.
To help Mary to prepare for the upcoming concert.
C.
To talk with Mary about going to the concert.
D.
To ask Mary to stop worrying about the exam.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
It will last for two weeks.
B.
It has come to a halt.
C.
It will end before long.
D.
It will probably continue.
【单选题】听力原文：M: I've been getting annoying calls for two weeks. When I answer the phone, the other party hangs up without saying anything. I've tried everything including blowing a whistle into the receiver. ...
A.
Disconnect his telephone.
B.
Blow a whistle into the receiver.
C.
Keep a record of incoming annoyance calls.
D.
Report his problem to the police.
【简答题】Solar Systems Co (S Co) makes two types of solar panels at its manufacturing plant: large panels for commercial customers and small panels for domestic customers. All panels are produced using the sam...
【单选题】听力原文：M: We were on vacation two weeks. W: And half the time it was rainy. Q: What does the woman imply? (18)
A.
She did not like all the rain.
B.
The rain is good for the crops.
C.
Part of each day was clear.
D.
She hopes the drought is over.
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