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【单选题】
镁粉在焰火、闪光粉、鞭炮的制造中是不可少的原料。工业上制造镁粉是将镁蒸气在某气体中冷却。下列气体：①空气；②二氧化碳；③氩气；④氢气；⑤氮气中可作冷却气体的是（ ）A.
①②
B.
②③
C.
③④
D.
④⑤
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举一反三
【单选题】---Why are you standing there, Maggie? ---I can’t see the blackboard clearly. Two tall boys are sitting _______ me.
A.
behind
B.
in front of
C.
beside
D.
next to
【单选题】Out there, in the midst of the snow, ______ in long, black clothes．
A.
a woman sat
B.
sat a woman
C.
sitting a woman was
D.
a woman was sitting
【单选题】In the reading room, we found her ______ at a desk, with her attention _______ on a book.A．sitti
A.
24. In the reading room, we found her ______ at a desk, with her attention _______ on a book. A．sitting; fixing
B.
sat; fixed
C.
seating; fixing
D.
seated; fixed
【单选题】新能源技术的发展与其他技术的发展 样,很大程度上受社会需要的制约。化石燃料价格的稳中有降使新能源技术的发展趋势减弱。但从长远看,科学的发展和资源条件的演变将推动能源技术的发展出现新的突破,产生真正代替化石能源技术的新能源技术。 这段话主要支持了这样一个论点,即 ( )
A.
新能源的发展阻力很大。
B.
新能源不可能成为化石能源的替代产品。
C.
新能源技术虽在目前发展缓慢，仍是一项很有 发展前途的技术。
D.
新能源必将代替化石能源。
【单选题】以下对维护海外利益安全的重要意义表述错误的是( )。
A.
维护海外利益安全是人类生存发展的基本条件
B.
维护海外利益安全是中国特色国家安全道路的重要体现
C.
“一带一路”建设带来海外利益格局新变化
【单选题】听力原文： As a writer, I seem to spend most of the time working in my office at home, sitting alone in front of the computer. In fact, the only people I see regularly are the members of my family, when th...
A.
In libraries.
B.
At a college.
C.
At her home.
【单选题】Don't have your children ______for hours doing their homework in ______dark a room.
A.
sitting, so
B.
sit, such
C.
to be sitting, so
D.
to sit, such
【简答题】---What's the matter with Jane? She has been sitting there for hours. ---A letter from her mother an attack of home sickness in her. A. set out B. set off C. sent off D. sent up
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