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【单选题】
对于某一反应系统,存在如下两个反应:A.
）A+2B===C+D ①主反应，目的产物为C
B.
）3A+4B===E+F ②副反应
C.
反应器入口A=10mol，出口C=6mol，E=1mol，则此反应系统中反应物A的转化率、目的产物的选择性分别为（ ）
D.
80%、85%
E.
90%、66.67%
F.
85%、66.67%
G.
60%、75%
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举一反三
【单选题】They have no idea at all___.
A.
where he has gone
B.
where did he go
C.
which place he has gone
D.
where has he gone
【单选题】He has courage all right, but in matters requiring judgment, he has often been found sadly ______.
A.
lack it
B.
absent
C.
in need of it
D.
wanting
【单选题】—He has never watched The Voice of China , ? —Yes, he has. It’s so hot all over China.
A.
has he
B.
hasn’t he
C.
did he
D.
didn’t he
【简答题】A．He has no experience at all. B．He has a charming personality. C．He is so lucky that he got the job. D．There were so many applicants.
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