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【单选题】
在下列各物质中,互为等电子体的是( )。A.
和O 3
B.
C和B +
C.
He和Li
D.
CO 2 和BH 3 CO
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反馈参考答案：
举一反三
【单选题】Before the job of teaching ______, families had been responsible for the education of the young. [ ]
A.
came to light
B.
came into being
C.
came to itself
D.
came into effect
【单选题】Before for the job. You will lie; required to take a language test.(B-0912’)
A.
apply
B.
applying
C.
applied
D.
to apply
【单选题】Application for the job must be _____ before noon tomorrow.
A.
arranged
B.
edited
C.
interviewed
D.
submitted
【单选题】It's a good idea to list your________skills before heading for the job fair.
A.
workable
B.
manageable
C.
feasible
D.
marketable
【单选题】Before for the job. You will lie; required to take a language test.
A.
apply
B.
applying
C.
applied
D.
to apply
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