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【单选题】
2011年11月，我国自行研制的飞船“神舟八号”成功发射，并与“天宫一号”成功实现对接。火箭发射使用的燃料液氢需要低温加注，这个程序相当危险，一粒米大小的液氢掉在地上产生的热量足以造成爆炸。由于是低温加注，火箭和燃料管道的接头部位会结霜，工作人员必须不停地用稀有气体吹接头，防止结霜。据此，以下说法正确的是 [ ]A.
液氢和氢气的性质不同
B.
稀有气体是化合物
C.
冰水共存物是混合物
D.
液氢是单质
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【简答题】听下面一段材料，回答第1至4题。 1. What is this speech about? A. A special group. B. A new class. C. A concert. 2. How often will everyone meet each week? A. One time. B. Three times. C. Five times. 3. What will a p...
【简答题】制定我国《食品安全法》的根本目的是保障公众身体健康和生命安全，其前提是：（） A、保证食品安全 B、保障食品生产者利益 C、保护食品正常出口 D、严惩违法行为
【单选题】What is the topic of this speech?
A.
Measures to strengthen the contact between parents and schools.
B.
Measures to improve children’s behavior in school.
C.
Measures to strengthen teachers’ authority.
D.
Measures to protect teachers from false allegations against them.
【单选题】What is the purpose of this speech?
A.
to tell others about a winning philosophy
B.
to explain why the speaker's team never loses
C.
to persuade the audience to give up coaching
【单选题】What is this speech for?
A.
Introducing cultural programs
B.
Telling stories of Beijing history
C.
Introducing Cuju
D.
Praising women football team
【简答题】听下面一段材料，回答第1-4题。 1. What is this speech about? A. A special group. B. A new class. C. A concert. 2. How often will everyone meet each week? A. One time. B. Three times. C. Five times. 3. What will a p...
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