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【简答题】
If ____ pairs of electrons are shared, a double bond is formed .
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反馈参考答案：
举一反三
【单选题】A low-carbon lifestyle has ______ effect on our daily life. People are paying more and more attention to saving ______ these days. [ ]
A.
the, energies
B.
a, energy
C.
an, energy
D.
a, energies
【单选题】What can be inferred from the passage?
A.
Happenings that go unnoticed deserve more attention.
B.
In a series of misfortunes the third one is usually the most serious.
C.
People tend to make use of evidence that supports their own beliefs.
D.
Believers of misfortunes happening in threes are cautious in interpreting events.
【简答题】等角度点是指生成圆弧或整圆上按照点数及( )j进行等分的点。
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