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【单选题】
关于烯烃与氢卤酸、水、硫酸的加成反应，下列理解不正确的是A.
这三种反应都属于亲电加成反应。
B.
氢卤酸、水、硫酸所提供的亲电试剂都是H+。
C.
丙烯与硫酸反应制备伯醇。
D.
加成产物遵循规则，氢加在含氢多的双键碳原子上。
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【单选题】At a rough look, the area of the city is about ______ the old one.A．three times the size asB．thr
A.
28. At a rough look, the area of the city is about ______ the old one. A．three times the size as
B.
three times the size of
C.
three times that is
D.
three times what is
【简答题】(electric) ______in the area has been cut for three hours because of thunderstorm.
【单选题】Don’t you think that the river is _________ now?
A.
much cleaner
B.
very cleaner
C.
much clean
D.
cleanest
【单选题】More than three nature reserves have been established in this area ______ hunting is forbidden.
A.
that
B.
since
C.
where
D.
if
【多选题】关于承诺撤回的说法中，正确的是（ ）。
A.
承诺的撤回没有限制
B.
撤回承诺的通知应当在承诺通知到达要约人之前或者与承诺通知同时到达要约人
C.
承诺一经作出，就能产生合同成立的法律后果
D.
只有以书面通知形式和口头形式作出的承诺才有可能撤回
E.
承诺的撤回，是指在发出承诺后，承诺生效前，受要约人宣告收回所发出的承诺，取消 其效力的行为
【单选题】Don’t you think that you can compare it with 17 itself?
A.
life
B.
work
C.
adventure
D.
mankind
【简答题】在Excel中，（ ）函数是求一组值的平均值。
【单选题】______storms wreaked havoc on the area, leaving three people dead and dozens injured.
A.
Vibrant
B.
Violent
C.
EnergetiC
D.
Full
【单选题】____ in the area reported _____ three people robbing the bank with their heads wrapped in stocks.
A.
Witness; to look at
B.
Witnesses; seeing
C.
Witnesses; looking out
D.
Witness; to see
相关题目：
【单选题】Don’t you think that you can compare it with 17 itself?
A.
life
B.
work
C.
adventure
D.
mankind