【单选题】【消耗次数：1】
I suddenly noticed someone ____________ at me near the door of the court.
①
stare
②
stared
③
stares
④
staring
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相关题目
【单选题】
I was caught up ___________ conversation with a friend when someone knocked at the door.
①
in
②
at
③
over
④
off
【单选题】
I didn’t know what to do, but then an idea suddenly ________ to me.
①
appeared
②
happened
③
occurred
④
emerged
【单选题】
Theres the bell; someone is at the door.
①
A.那里有个铃；门口有个人。
②
B.那里有个铃；有人在叫门。
③
C.铃响了，有人在门口。
④
D.铃响了，有人叫门。
【单选题】
Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
①
as
②
since
③
until
④
before
【单选题】
Alice rudely showed me the door.
①
A.爱丽斯无礼地向我指了一下门的位置。
②
B.爱丽斯无礼地让我看了看她的门。
③
C.爱丽斯无礼地把我送到门口。
④
D.爱丽斯无礼地把我轰出了门。
【单选题】
I noticed her ____ a pen from the ground.
①
to pick out
②
to pick up
③
pick out
④
pick up
【单选题】
She was so _____ in her job that she didn’t hear someone knocking at the door.
①
attracted
②
drawn
③
absorbed
④
concentrated
【单选题】
If someone calls me, ask him or her to leave a [填空] .
①
message
②
letter
③
sentence
④
notice
【单选题】
If by any chance someone comes to see me, ask the person to leave a ____.
①
message
②
letter
③
sentence
④
notice
随机题目
【单选题】
行列式<img src=http://p.ananas.chaoxing.com/star3/origin/3d03e97824e69686b5361c050ff7f67c.png/>的代数余子式<img class=jc-formula data-tex={ A }_{ 32 } src=https://huaweicloudobs.ahjxjy.cn/7300D9072247338D469B6CFEB721DD87.png style=vertical-align: middle;/>=（ ）
①
10
②
-10
③
12
④
-12
【单选题】
<img class=jc-formula data-tex=行列式\quad \begin{ vmatrix } 2 \begin{ matrix } -4 1 \end{ matrix } \\ 1 \begin{ matrix } -5 3 \end{ matrix } \\ 1 \begin{ matrix } -1 1 \end{ matrix } \end{ vmatrix }\quad = src=https://huaweicloudobs.ahjxjy.cn/FDF28FC6F756F3CD94C74576BA5B9CE9.png style=vertical-align: middle;/>
①
-8
②
8
③
-15
④
15
【单选题】
设<img class=jc-formula data-tex=P(A)=p,P(B)=q,P(A\cup B)=r src=https://huaweicloudobs.ahjxjy.cn/181E43153EA4CC8D9DFCC275A4A92148.png style=vertical-align: middle;/>,则<img class=jc-formula data-tex=P(\bar { A } \cup \bar { B } ) src=https://huaweicloudobs.ahjxjy.cn/2EB1FFC14BA744B554C1152EF1C51F02.png style=vertical-align: middle;/>=( )A. p-q-r; B.p+q-r; C.r-q; D.1-p-q+r.
①
A
②
B
③
C
④
D
【单选题】
设<img class=jc-formula data-tex={ \alpha }_{ 1 },{ \alpha }_{ 2 } src=https://huaweicloudobs.ahjxjy.cn/F7A9179A3B95E4A689239C902E737612.png style=vertical-align: middle;/>是齐次线性方程组 Ax=0的两个解向量, <img class=jc-formula data-tex={ \beta }_{ 1 },{ \beta }_{ 2 } src=https://huaweicloudobs.ahjxjy.cn/677A921FCF83E4151EDA6846AC691BB6.png style=vertical-align: middle;/>是非齐次线性方程组 Ax=b的两个解向量， 则 ( )
①
<img class=jc-formula data-tex={ \alpha }_{ 1 }+{ \alpha }_{ 2 } src=https://huaweicloudobs.ahjxjy.cn/98BBDE0A4EFEE09BB8F566CD2715C8F7.png style=vertical-align: middle;/>是 Ax=0的解；
②
<img class=jc-formula data-tex={ \beta }_{ 1 }-{ \beta }_{ 2 } src=https://huaweicloudobs.ahjxjy.cn/BF39B64659F7FEB5CBDDEC9EA5850379.png style=vertical-align: middle;/>是Ax=0的解；
③
<img class=jc-formula data-tex={ \alpha }_{ 1 }+{ \beta }_{ 1 } src=https://huaweicloudobs.ahjxjy.cn/51DC9D39B9996C3CB0ABB213D8FA6EA0.png style=vertical-align: middle;/>是 Ax=0的解；
④
<img class=jc-formula data-tex={ \alpha }_{ 1 }-{ \beta }_{ 1 } src=https://huaweicloudobs.ahjxjy.cn/6F764E5023C0764878568584418D58B9.png style=vertical-align: middle;/>是 Ax=b的解.
【单选题】
设连续型随机变量X的密度函数有f(x)=f(-x)，F(X)是X的分布函数，则下列成立的有（A）F(-a)=F(a); （B）F(-a)=(1/2)F(a);（C）F(-a)=1-F(a);（D）F(-a)=(1/2)-F(a).
①
(A)
②
(B)
③
(C)
④
(D)