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搜题/搜资源
【单选题】【消耗次数:1】
We started out early in order that we ____ there in time.
①
would get
②
ought get
③
should get
④
had to
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【单选题】
There are ________ people in front of the cinema gate so we have to wait ________ time to get into the cinema.
①
too much; much too
②
too many; too much
③
much too; too much
④
too much; too many
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【单选题】
As a freshman, we should get to know campus ( ) as soon as possible and make good use of them.
①
Source
②
sources
③
resource
④
resources
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【多选题】
We were very tired and wanted to get home ____________________ .
①
as soon as possible
②
as quickly as possible
③
as fast as possible
④
as much as possible
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【单选题】
We often get ____ when people cut in line.
①
annoying
②
annoyed
③
to annoy
④
annoy
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【单选题】
We often get ____ when people cut in line.
①
annoying
②
annoyed
③
to annoy
④
annoy
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【判断题】
we from Beijing to Guangzhou will get jet lag.
①
正确
②
错误
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【单选题】
We often get _______ when people cut in line.
①
annoying
②
annoyed
③
to annoy
④
annoy
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【判断题】
Youll have to get off here.??This is enough far for we go.
①
正确
②
错误
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【单选题】
A: I need to buy a wedding gift for Jane. B: Should we stop at the shopping center? A: [填空]. The weddings not until next week, but I wont have time later to get them anything.
①
Wont be necessary
②
Its your call
③
I suppose so
④
If you insist
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【单选题】
By the time you get there, the guests will [填空].
①
have left
②
leave
③
left
④
be leaving
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随机题目
【单选题】
已知E(X)=1,E(Y)=2,E(XY)=3,则X,Y的协方差Cov(X,Y)=( )
①
2
②
1
③
0
④
3
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【单选题】
设随机变量<img class=jc-formula data-tex=X_{ i }\sim \left( -1\quad \quad \quad 0\quad \quad 1\\ \frac { 1 }{ 4 } \quad \frac { 1 }{ 2 } \quad \frac { 1 }{ 4 } \right) (i=1,2) src=https://huaweicloudobs.ahjxjy.cn/D507955A388085D7F597D003F1F5E539.png style=vertical-align: middle;/>且满足<img class=jc-formula data-tex=P(X_{1}X_{2}=0)=1 src=https://huaweicloudobs.ahjxjy.cn/14A2767F554AB0088FBD6A8217107D33.png style=vertical-align: middle;/>,则<img class=jc-formula data-tex=P(X_{1}=X_{2})= src=https://huaweicloudobs.ahjxjy.cn/823B72B05F6C641DB58892CFEE30732D.png style=vertical-align: middle;/>
①
0
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1/4
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1/2
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1
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【单选题】
两个相互独立的随机变量X和Y分别服从正态分布N(0,1)和N(1,1),则
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<img class=jc-formula data-tex=P(X+Y\le 0)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/2D796C16E4ADCDC598AFA0E462095A7C.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=P(X+Y\le1)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/7CB2C1C70ED2C80A1B88E527EB9CA463.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=P(X-Y\le 0)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/FB3B9FB1D8E1D2482BA90188CE469A84.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=P(X-Y\le 1)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/03DC9D32FBCAC18FA548285A7F9DF6CC.png style=vertical-align: middle;/>
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【判断题】
将一枚均匀骰子连掷两次,则两次点数中最大点数不超过3的概率为1/4.
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正确
②
错误
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【判断题】
将一枚均匀骰子连掷两次,则两次点数之和为8的概率为5/36.
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正确
②
错误
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【判断题】
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正确
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【判断题】
有甲乙两批种子,发芽率分别为0.8和0.7,在两批种子中各任意选取一粒,则至少有一粒种子发芽的概率为0.06.
①
正确
②
错误
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【判断题】
将一枚均匀骰子连掷两次,则两次点数之和为8的概率为1/36.
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正确
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错误
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【判断题】
教室中有r个学生,则他们的生日(一年以365天计)都不相同的概率是<img class=jc-formula data-tex=\frac { { A }_{ 365 }^{ r } }{ { 365 }^{ r } } src=https://huaweicloudobs.ahjxjy.cn/6C838E81EA84324651C979BC1EE9DCF5.png style=vertical-align: middle;/>
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正确
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【判断题】
有甲乙两批种子,发芽率分别为0.8和0.7,在两批种子中各任意选取一粒,则恰好有一粒种子发芽的概率为0.24.
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正确
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