题目内容

The government has already proposed and introduced a package of plan to ________ negative impact of financial crisis.

A. manage
B. tackle
C. cope
D. deal

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Nowadays, a wholefood diet free from ________ additives, colors and flavors is increasingly popular among people.

A. architectural
B. automatic
C. artificial
D. arguable

In this ________ meeting, we made a lot of important decisions and made agreements on certain issues.

A. spiteful
B. merciful
C. dreadful
D. fruitful

按分子轨道理论，下列稳定性排列正确的是

A. O2 > O2＋> O22－
B. O2＋> O2 > O22－
C. O22－> O2 > O2＋
D. O2＋> O22－> O2

下列关于 O22－和 O2－的性质的说法中，不正确的是

A. 两种离子都比 O2 分子稳定性小
B. O22－的键长比 O2－键长短
C. O22－是反磁性的，而 O2－是顺磁性的
D. O22－的键能比 O2－的键能小