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【简答题】
年 月“神舟 ”发射成功．这次发射过程共有四个值得关注的环节，即发射、实验、授课、返回．据统计，由于时间关系，某班每位同学收看这四个环节的直播的概率分别为 、 、 、 ，并且各个环节的直播收看互不影响． （1）现有该班甲、乙、丙三名同学，求这 名同学至少有 名同学收看发射直播的概率; （2）若用 表示该班某一位同学收看的环节数,求 的分布列与期望．
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举一反三
【单选题】On no account ______ ever leave the baby at home alone.
A.
should you
B.
you should
C.
shall you
D.
you shall
【简答题】________是国家信息中心以打造国家经济形势晴雨表为目标推出的一个全面反映我国经济运行态势和经济政策变动的海量信息平台。
【单选题】The possible meaning of the sentence “You should know better than to leave your little sister at home by herself” is _________.
A.
You should be wise enough not to leave your little sister at home by herself.
B.
You should be wise enough to leave your little sister at home by herself.
C.
You should leave your little sister at home by herself.
D.
You should stay at home.
【多选题】Why should you leave adequate time when you trasfer in the stopover?
A.
Sometimes you need to change ternimals.
B.
You should need enough time to go through the security check.
C.
You need time to shop at the duty-free shop.
D.
You need time to meet some friends.
【单选题】When you want to leave your present job, you should write a letter ______.
A.
refusing a job offer
B.
requesting references
C.
of application
D.
of resignation
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