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【简答题】
大气中的硫和氮的氧化物有____和____两个来源。二氧化硫的自然来源包括____和____,含盐的海水飞沫也增加大气中的硫。
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反馈参考答案：
举一反三
【多选题】在网络化的情况下，顾客概念及顾客行为发生了很大变化，下面选项中属于消费变化的为：（）。
A.
顾客从大众中分离
B.
顾客直接参与生产和商业流通
C.
大范围地选择和理性的购买
D.
顾客追求价廉物美
E.
顾客追求时尚
【简答题】函数f（x）= x -cosx在[0，+∞）内 （ ） A．没有零点 B．有且仅有一个零点 C．有且仅有两个零点 D．有无穷多个零点
【单选题】The writer thinks British drivers' behaviour to the misconduct of other drivers is too ______.
A.
timid
B.
unassertive
C.
tolerant
D.
aggressive
【简答题】A．She can't sleep well these days. B．She is not good at some subjects. C．She is under the pressure of her parents' love. D．She has suffered from headache.
【单选题】My sister has been feeling ______ since she started her first job. She can’t sleep well.
A.
stressed
B.
unpleasant
C.
confident
D.
sudden
【单选题】A.She called the police.B.She got a sound sleep.C.She attended a ball.##
A.
She called the police.
B.
She got a sound sleep.
C.
She attended a ball.
D.
She didnt sleep at all.
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