【单选题】【消耗次数:1】
A: Is there anything I can do for you? B: [填空], there is something.
No, nothing
Well, now that you ask
Nothing I can think of
If you ask me
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相关题目
【判断题】 A: What can I do for you, sir? B: Nothing.
①  正确
②  错误
【判断题】 A: What do you think of these skirts? B: I think nothing.
①  正确
②  错误
【单选题】 A: Can I help you? B: [填空]. Where do I pay my fees?
①  Thank you
②  As you please
③  Yes, you can
④  Yes, please
【判断题】 A: Do you think I can use your computer for one day? B: No you cant.
①  正确
②  错误
【单选题】 What can I do for you, madam?
①  I want a kilo of apples
②  You can go your own way
③  Thanks
④  Excuse me. I’m busy
【单选题】 13.Don’t ______ to let me know if there’s anything I can do for you.
①  thrill
②  hesitate
③  reject
④  puzzle
【单选题】 Woman: Bob, do you think you can lend me fifty dollars? Bob: Let me see. ____
①  You know I have no money at all.
②  Sorry, I don’t think I have much with me.
③  I don’t think you should do it.
④  Oh, I have quite a lot.
【单选题】 —Hello there, what can I do for you, sir?—_____________________.
①  I can do it myself.
②  No, youre welcome.
③  I would like to buy a pair of glasses.
④  Yes, thank you.
【多选题】 A: I think the boy can do it well.B:_________ .
①  Certainly
②  Sure
③  I agree
④  Ill do it
【单选题】 A: Are you ready for the test tomorrow? B: [填空] A: Come on, I am sure you will do well.
①  Why do you ask?
②  No. Im afraid not.
③  Sure, no problem.
④  What about you?
随机题目
【单选题】 已知X与Y相互独立,且D(X)=3,D(Y)=4,则D(2X-3Y)= ( )
①  -24
②  12
③  -6
④  48
【单选题】 设二维随机变量(X,Y)只取下列数组中的值:(0,0)(-1,1)(-1,1/3)(2,0)且相应概率依次为1/6,1/3,1/12,5/12,则E(X+Y)=( )
①  7/9
②  3/7
③  5/6
④  10/9
【单选题】 若随机变量X,Y相互独立,EX=EY=0,DX=DY=1,则E(X+Y+1)2=
①  2
②  3
③  1/3
④  1
【单选题】 设连续型随机变量X的分布函数为F(x)=A+Barctan x,则常数A和B分别为( )
①  1/2, 1/π
②  1/4, 1/2
③  1/2, 1/4
④  1/π, 1/π
【单选题】 设二维随机变量(X,Y)的分布律为<img src=https://huaweicloudobs.ahjxjy.cn/D5F8A330116E2722ED7C918300344FC5.png style=vertical-align: middle;/>则P{Y=1}=(  )
①  0.3
②  0.4
③  0.7
④  0.8
【单选题】 已知X与Y相互独立,且D(X)=3,D(Y)=4,则D(2X-3Y)= ( )
①  -24
②  18
③  -6
④  48
【单选题】 设随机变量X在区间[0,1]服从均匀分布,则E(2X)= ( )
①  0
②  1/2
③  1
④  2
【单选题】 设二维随机变量 只取下列数组中的值:(0,0)(-1,1)(-1,1/3)(2,0)且相应概率依次为1/6,1/3,1/12,5/12,则E(X+Y)=( )
①  3/7
②  5/6
③  10/9
④  7/9
【单选题】 如果随机变量X可能取值充满下列哪个区间,且在此区间外等于0,那么sinx可以成为一个随机变量的概率密度函数。
①  <img class=jc-formula data-tex=[0,0.5\pi ] src=https://huaweicloudobs.ahjxjy.cn/A12FCF1850202081A85EB626E29AE9DF.png style=vertical-align: middle;/>
②  <img class=jc-formula data-tex=[0.5\pi,1.5\pi ] src=https://huaweicloudobs.ahjxjy.cn/8339D94C7C4D438BEB1D32B91B83BEBD.png style=vertical-align: middle;/>
③  <img class=jc-formula data-tex=[0,\pi ] src=https://huaweicloudobs.ahjxjy.cn/8FD64D2186988230279B59E0B1E62309.png style=vertical-align: middle;/>
④  <img class=jc-formula data-tex=[\pi,1.5\pi ] src=https://huaweicloudobs.ahjxjy.cn/BBF9237701F8BD261880121FDEED8A64.png style=vertical-align: middle;/>
【单选题】 设(X,Y)为二维随机向量,D(X)=16,D(Y)=25,ρXY=0.6,则Cov(X,Y)=( )
①  12
②  20
③  3
④  8