【单选题】【消耗次数：1】
Every summer they____ the neighbours at an outdoor party.
①
treat
②
invite
③
devote
④
entertaining
参考答案：
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相关题目
【单选题】
A: This meal is on me. [填空]. B: Thanks, but isnt it my turn to treat you?
①
Its none of your business
②
Ill treat you
③
My pleasure
④
I invite you
【单选题】
They know the sport inside out, and we treat them with the respect they ______.
①
deserve
②
inspect
③
encounter
④
undermine
【单选题】
What a rainy summer we’ve had!
--Yes, there only three sunny weekends the whole summer.
①
have been
②
are
③
had been
④
has been
【单选题】
We often go __________ in the river in summer.
①
to swimming
②
swim
③
to swim
④
swimming
【单选题】
—Would you like to come to our party this weekend?—______.
①
Yes, it was an interesting party
②
No, I’d like to
③
I’m sorry that I won’t be able to attend the party
④
No
【单选题】
—What about learning a foreign language in the summer holiday?— .
①
It’s a good idea.
②
Yes, I agree with you.
③
No, I don’t think so.
④
yes,perfect.
【单选题】
— _________________________— Thanks! Its very kind of you to invite me.
①
How are you？
②
Happy Mid-Autumn Festival！
③
Do you like this festival?
④
Would you like something to have？
【单选题】
If I with her last summer，I with her now.
①
worked…am getting on very well
②
had worked…would get on very well
③
had worked… would have got on very well
④
had worked…will get on very well
随机题目
【单选题】
以下属于人力资源供给预测方法的是（ ）。
①
主观判断法和定量分析法
②
马尔可夫转移矩阵法和定量分析法
③
定量分析法和人员继承法
④
人员替代法和马尔可夫转移矩阵法
【多选题】
设随机变量X的函数Y=aX+b（a，b为常数），且EX,DX均存在，则下列正确的有
①
EY=aEX
②
<img class=jc-formula data-tex={ DY=a }^{ 2 }DX src=https://huaweicloudobs.ahjxjy.cn/41243845F2F7553DFE0624D09A598D1F.png style=vertical-align: middle;/>
③
EY=aEX+b
④
DY=aDX+b
【多选题】
下列关于概率密度函数f(x)的描述正确的是（ ）
①
<img class=jc-formula data-tex=f(x)0 src=https://huaweicloudobs.ahjxjy.cn/D6C9C43C754A0AE8BD392A6EC899AD97.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=f(x)\ge 0 src=https://huaweicloudobs.ahjxjy.cn/F98D2BC7D99A7C40F0016561A8BCE0C5.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\int _{ -\infty }^{ +\infty }{ f(x)dx } =0 src=https://huaweicloudobs.ahjxjy.cn/DD35C526F3C8D140380ECF92EAFF6EE5.png style=white-space: normal; vertical-align: middle;/>
④
<img class=jc-formula data-tex=\int _{ -\infty }^{ +\infty }{ f(x)dx } =1 src=https://huaweicloudobs.ahjxjy.cn/0F43307D97ABB532078C273D367BA310.png style=white-space: normal; vertical-align: middle;/>
【多选题】
下列陈述中正确的有（ ）
①
随机变量X与Y不相关，则它们一定相互独立。
②
随机变量X与Y相互独立，则它们不相关。
③
对随机变量X，Y来说，E(X+Y)=E(X)+E(Y)一定成立.
④
对随机变量X，Y来说，D(X+Y)=D(X)+D(Y)一定成立.
【多选题】
设人的身高X为一随机变量，其期望EX=a，方差D(X)=b，假设现在有10个完全独立的同学，其平均身高记为Y，则下列给出的式子正确的有（ ）
①
EY=a
②
EY=0.1a
③
DY=0.1b
④
DY=b