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【单选题】
一位医师选择了100名被诊断为新生儿黄疸的儿童和同期住院的100名非黄疸儿童,然后调查他们母亲的产科记录和分娩记录,以确定各种产前和围产期的暴露情况,该研究属于A.
现况研究
B.
病例对照研究
C.
实验性研究
D.
队列研究
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】.No sooner____to shine____it clouded over again.
A.
the sun had started;than
B.
had the sun started;than
C.
the sun started;when
D.
did the sun started;when
【单选题】They had no sooner arrived at the airport ________ it was time to check in. [ ]
A.
when
B.
before
C.
than
D.
though
【单选题】Which of the following contains an adverbial clause of time?
A.
No sooner had I got home than it began to rain.
B.
I do remember, now that you mention it.
C.
You'll be late unless you hurry.
D.
Much as I'd like to, I can't come.
【单选题】No sooner _______ the competition _______ _______ an unexpected accident happened.
A.
did … begin; than
B.
had … begun; when
C.
did … begin; when
D.
had … begun; than
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