【单选题】【消耗次数：1】
4. David watched her car until it ____ from view.
①
remained
②
delayed
③
grew
④
disappeared
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相关题目
【单选题】
David watched her car until it ________ from view.
①
remainded
②
dalayed
③
grew
④
disappeared
【单选题】
4. The instructor watched the student ____ the test.
①
to take
②
take
③
takes
④
took
【单选题】
I caught a____ of the car before it disappeared around the
bend.
①
glance
②
glimpse
③
look
④
see
【单选题】
I caught a___ of the car before it disappeared around the bend.
①
glance
②
glimpse
③
glare
④
stare
【单选题】
They grabbed her _____ arm and forced her into the car.
①
by her
②
by the
③
in her
④
in the
【单选题】
The taxi driver _______ at me in the rear-view mirror when I got on the car.
①
smile
②
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③
grinned
④
stared
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The car beeped at me until I fastened my seatbelt.
①
A.汽车向我发出了嘟嘟的声音，直到我系上了安全带。
②
B.汽车发出嘟嘟的声音，我系上安全带就不响了。
③
C.汽车在我系上安全带之前才发出嘟嘟的声音。
④
D.汽车发出嘟嘟的声音，我才系上了安全带。
【单选题】
A suitcase with shirt, trousers and shoes __________ stolen from the car.
①
have been
②
has
③
was
④
are
【单选题】
It was not until she had finished all her work_____.
①
did she return
②
that she returned
③
when she returned
④
that did she return
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设三阶实对称矩阵<img class="jc-formula" data-tex="A" src="https://huaweicloudobs.ahjxjy.cn/60BDCDAB2585C1363A4374A112B62C6E.png" style="vertical-align: middle;"/>的特征值是1,2,3，矩阵<img class="jc-formula" data-tex="A" src="https://huaweicloudobs.ahjxjy.cn/60BDCDAB2585C1363A4374A112B62C6E.png" style="vertical-align: middle;"/>的对应于1,2的特征向量分别为<img src="https://huaweicloudobs.ahjxjy.cn/5DBC389B825B035A59A934A4AE227952.png" title="4.png" alt="4.png"/>（1）求矩阵<img class="jc-formula" data-tex="A" src="https://huaweicloudobs.ahjxjy.cn/60BDCDAB2585C1363A4374A112B62C6E.png" style="vertical-align: middle;"/>的对应于特征值3的特征向量。（2）求矩阵<img class="jc-formula" data-tex="A" src="https://huaweicloudobs.ahjxjy.cn/60BDCDAB2585C1363A4374A112B62C6E.png" style="vertical-align: middle;"/>。