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【单选题】
环己烷产生构象的原因是( )。A.
环的张力
B.
碳原子具有sp3杂化轨道
C.
σ键的旋转
D.
碳原子所形成的键角要求109.5°
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举一反三
【单选题】______ the neighbouring countries, the Japanese government refuses to admit the crime they did in World WarⅡin history. [ ]
A.
What disappoints
B.
Much to the disappointment of
C.
It disappoints
D.
Which is to disappoint
【简答题】提高生态文明水平，关键是在环境保护上取得突破性进展。遵循( )的基本要求。 A代价小 B效益好 C排放低 D可持续
【单选题】What did the Japanese government say they hunt whales for?
A.
For the meat.
B.
For scientific research.
C.
For commercial reasons.
D.
For political reasons.
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