【单选题】【消耗次数：1】
They ______ thankful to have the opportunity to further their studies.
①
would like to be
②
ought to be
③
would rather be
④
had better be
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相关题目
【单选题】
— Would you like to have some icecream?— _______________
①
I don’t know.
②
No，thanks.
③
I dont like it.
④
I like it.
【单选题】
Would you like to have dinner with us this evening?
①
OK, but I have to go to a meeting now
②
No, I can’t
③
I’d love to, but this evening I have to go to the airport to meet my parents
④
I don’t know
【单选题】
30. -Would you like to have tea or coffee? - ____.
①
Either will do
②
Neither do I
③
It doesn’t matter
④
Yes, please
【单选题】
If I had remembered __________ the window, the thief would not have got in.
①
to close
②
closing
③
to have closed
④
having closed
【判断题】
I’m____inclined_____ to think that most children would like their teachers to be their friends rather than their commanders.
①
正确
②
错误
【单选题】
We are going to have a singing party tonight. Would you like to join us?___________
①
I’m afraid not, because I have to go to an important meeting.
②
Of course not. I have no idea.
③
No, I can’t.
④
That’s all set.
【单选题】
We are going to have a dancing party tonight. Would you like to join us?
①
I’m afraid not. Because I have an appointment with my dentist tonight
②
Of course not. I have no idea
③
No, I can’t
④
That’s all set
【单选题】
I had to complete the assignment by Friday [] otherwise, I would have failed the course.
①
comma
②
semicolon
【单选题】
—Would you like some orange juice？—________________.
①
Yes, I would.
②
No, thank you.
③
Im full.
④
I dont like juice.
随机题目
【单选题】
设随机变量X的分布函数为<img class=jc-formula data-tex={ F }_{ X }(x) src=https://huaweicloudobs.ahjxjy.cn/C9AA53C55E70D9C9A10EC19860616D92.png style=vertical-align: middle;/>，则Y=3-5X的分布函数为<img class=jc-formula data-tex={ F }_{ Y }(y) src=https://huaweicloudobs.ahjxjy.cn/C6606AD65DF04F9951D7032A6FAC7119.png style=vertical-align: middle;/>=
①
<img class=jc-formula data-tex={ F }_{ X }(5y-3) src=https://huaweicloudobs.ahjxjy.cn/AE4AC4605E1695616F4C9F45FB2D964F.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=5{ F }_{ X }(y)-3 src=https://huaweicloudobs.ahjxjy.cn/716A197607430372E288CE95DF98C9E7.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ F }_{ X }(\frac { y+3 }{ 5 } ) src=https://huaweicloudobs.ahjxjy.cn/43D011CA26A865C7F09E3CAD2C4C1025.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=1-{ F }_{ X }(\frac { 3-y }{ 5 } ) src=https://huaweicloudobs.ahjxjy.cn/645270C44359FC04B262389FD61E94A3.png style=vertical-align: middle;/>
【单选题】
已知随机变量X的密度函数<img class=jc-formula data-tex=f(x)=\begin{ cases } A{ e }^{ -x },x\ge \lambda \\ 0,\quad x\lambda \end{ cases }(\lambda 0,A src=https://huaweicloudobs.ahjxjy.cn/170AA0E56CF07A9CB01C1277AD5B5B64.png style=vertical-align: middle; width: 138px; height: 38px; width=138 height=38/>为常数)，则概率<img class=jc-formula data-tex=P\left\{ \lambda \lambda +a \right\} (a0) src=https://huaweicloudobs.ahjxjy.cn/414D170A5B5901D4BDB55E9237201D47.png style=vertical-align: middle; width: 142px; height: 22px; width=142 height=22/>的值
①
与a无关，随<img class=jc-formula data-tex=\lambda src=https://huaweicloudobs.ahjxjy.cn/14C3B57DF5E84C1472D22AC460DC2BA0.png style=vertical-align: middle;/>的增大而增大
②
与a无关，随<img class=jc-formula data-tex=\lambda src=https://huaweicloudobs.ahjxjy.cn/14C3B57DF5E84C1472D22AC460DC2BA0.png style=font-family: 宋体; font-size: 14px; white-space: normal; vertical-align: middle;/>的增大而减小
③
与<img class=jc-formula data-tex=\lambda src=https://huaweicloudobs.ahjxjy.cn/14C3B57DF5E84C1472D22AC460DC2BA0.png style=font-family: 宋体; font-size: 14px; white-space: normal; vertical-align: middle;/>无关，随a的增大而增大
④
与<img class=jc-formula data-tex=\lambda src=https://huaweicloudobs.ahjxjy.cn/14C3B57DF5E84C1472D22AC460DC2BA0.png style=white-space: normal; font-family: 宋体; font-size: 14px; vertical-align: middle;/>无关，随a的增大而减小
【单选题】
设随机变量<img class=jc-formula data-tex=\Chi \sim N(0，,1) src=https://huaweicloudobs.ahjxjy.cn/DFE0A2227AA81DF0DE5932390507D429.png style=vertical-align: middle;/>,X的分布函数为<img class=jc-formula data-tex=\phi (x) src=https://huaweicloudobs.ahjxjy.cn/5018A48A97FBDEAFED5147C5150F70A3.png style=vertical-align: middle;/>，则<img class=jc-formula data-tex=P(\left| X \right| 2) src=https://huaweicloudobs.ahjxjy.cn/84EB141D9A30B7BA9B748F0CE43B31F5.png style=vertical-align: middle;/>的值为
①
<img class=jc-formula data-tex=2\left[ 1-\phi (2) \right] src=https://huaweicloudobs.ahjxjy.cn/1790E87889194815A84890F2C24D912F.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=2\phi (2)-1 src=https://huaweicloudobs.ahjxjy.cn/66E3AD4ED7467EC148F90DDAF6123574.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=2-\phi (2) src=https://huaweicloudobs.ahjxjy.cn/DABEE0F4766062E9EC14E2FA3FE29809.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=1-2\phi (2) src=https://huaweicloudobs.ahjxjy.cn/AE385B5AFD69AB78DD3A867D56396753.png style=vertical-align: middle;/>
【单选题】
随机变量X的概率密度为<img class=jc-formula data-tex=f(x)=\frac { 1 }{ 2\sqrt { \pi } } { e }^{ -\frac { { (x+2) }^{ 2 } }{ 4 } }\quad ,-\infty \infty src=https://huaweicloudobs.ahjxjy.cn/F8E72FB3A1A54D46E64E0345299BEE8F.png style=vertical-align: middle;/>且<img class=jc-formula data-tex=Y=aX+b\~ N(0,1) src=https://huaweicloudobs.ahjxjy.cn/8E15E33F02B26945524A7FC71E9C9548.png style=vertical-align: middle;/>，则在下列各组数中应取
①
<img class=jc-formula data-tex=a=\frac { 1 }{ 2 } ,b=1 src=https://huaweicloudobs.ahjxjy.cn/273FBE536480CFBCE96483626355D202.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=a=\frac { \sqrt { 2 } }{ 2 } ,b=\sqrt { 2 } src=https://huaweicloudobs.ahjxjy.cn/B7C9ED1416E8C0D715D99D1D7115140E.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=a=\frac { 1 }{ 2 } ,b=-1 src=https://huaweicloudobs.ahjxjy.cn/21219E734AD2124789AA7C8DCF6E740D.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=a=\frac { \sqrt { 2 } }{ 2 } ,b=-\sqrt { 2 } src=https://huaweicloudobs.ahjxjy.cn/72B2A84CB674B5FB81FF894521C9AD5B.png style=vertical-align: middle;/>
【单选题】
假设随机变量X的分布函数为F(x),密度函数为f(x).若X与-X有相同的分布函数，则下列各式中正确的是
①
F(x) = F(-x)
②
F(x) = - F(-x)
③
f (x) = f (-x)
④
f (x) = - f (-x)
【单选题】
某一随机变量的分布函数为<img class=jc-formula data-tex=F(x)=\frac { a+b{ e }^{ x } }{ 3+{ e }^{ x } } src=https://huaweicloudobs.ahjxjy.cn/CDF7AE99B7AA76193F7CC77B02969739.png style=vertical-align: middle;/>，(a=0,b=1),则F(0)的值为
①
0.1
②
0.5
③
0.25
④
以上都不对
【单选题】
设离散型随机变量X 的分布律为<img class=jc-formula data-tex=P(X=k)=\frac { A }{ { 3 }^{ k }k! } ,k=0,1,2,\cdots src=https://huaweicloudobs.ahjxjy.cn/04CAB3DAFF68A26912705C664D2D8B15.png style=vertical-align: middle;/>,则常数A应为
①
<img class=jc-formula data-tex={ e }^{ \frac { 1 }{ 3 } } src=https://huaweicloudobs.ahjxjy.cn/F6461829EACD16097EB7ECA1E0FB8301.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ e }^{ -\frac { 1 }{ 3 } } src=https://huaweicloudobs.ahjxjy.cn/08A3455A41E49071DE399CE99E03A8E1.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex={ e }^{ -3 } src=https://huaweicloudobs.ahjxjy.cn/E76083145705F64D30B8C539C3AC1A3D.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ e }^{ 3 } src=https://huaweicloudobs.ahjxjy.cn/3FFE50390A3F85E574931A20D02074F8.png style=vertical-align: middle;/>
【单选题】
设X的密度函数为f(x),分布函数为F(x)，且f(x)=f(-x)。那么对任意给定的a都有
①
<img class=jc-formula data-tex=f(-a)=1-\int _{ 0 }^{ a }{ f(x)dx } src=https://huaweicloudobs.ahjxjy.cn/1053A4F0A2AA674B748DEDF2A0D483FC.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=F(-a)=\frac { 1 }{ 2 } -\int _{ 0 }^{ a }{ f(x)dx } src=https://huaweicloudobs.ahjxjy.cn/61F92082226911122757503D71FAE009.png style=vertical-align: middle;/>
③
F(a)=F(-a)
④
F(-a)=2F(a)-1