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【单选题】
关于抽样调查的概念,下列哪项是错误的:A.
非全面调查中最常用的是抽样调查
B.
总体中随机抽取一定数量的观察单位称为样本
C.
随机性可以保证总体中每个调查单位被抽得的机会相等
D.
抽样调查即是典型调查
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反馈参考答案：
举一反三
【单选题】Explain: having an extremely close friendship
A.
variable
B.
magnetic
C.
intimate
D.
sensitive
【单选题】She admitted ______ a story to explain her absence.
A.
to have made up
B.
having told
C.
to have told
D.
having made up
【单选题】______ over and over again, but he still couldn’t understand.
A.
Having explained
B.
Having been explained
C.
Explaining
D.
It had been explained
【单选题】Can you explain ____ having done such a thing?
A.
the reason to me for
B.
the reason to me why
C.
me the erason why
D.
me the reason for
【多选题】下列抗疟药物中,哪些是天然产物
A.
Quinine
B.
Artemisinin
C.
Chloroquine
D.
Arteether
E.
Dihydroartemisinin
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