抽样平均误差的减少与样本均值更加集中有关

完型填空。
My name is Jack Smith. Jack 1 my first name, 2 Smith is my last name. I am 3 . I am 4 English boy. 　　I 5 a sister. 6 name is Mary. She is only four. She is a 7 little girl. My father and mother 8 teachers. They like 9 work. They have many 10 .
( )1. A. am ( )2. A. or ( )3. A. student ( )4. A. the ( )5. A. have ( )6. A. He ( )7. A. good ( )8. A. is ( )9. A. they ( )10. A. friend	B. is B. and B. fine B. a B. am B. His B. nice B. are B. our B. teachers	C. are C. but C. Class One C. an C. know C. She C. fine C. like C. their C. classes	D. be D. to D. twelve D. / D. see D. Her D. different D. think D. them D. students

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题型：判断题

在A、B两组人群中进行筛选，假定筛选试验的灵敏度和特异度是已知的，A人群患病率为10%，B人群为1%，则下列哪种结论是正确的（）

A.A人群阳性结果者中假阳性者所占比例低于B人群

B.A人群阳性结果者中真阳性的比例低于B人群

C.A人群中可靠性高于B人群

D.A人群中特异度低于B人群

E.A人群中灵敏度高于B人群

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题型：判断题

在印度、泰国制作欢迎贵宾的软花环的花材是（）。

A．茉莉、洋兰

B．香石竹、小菊

C．玫瑰、非洲菊

D．菊花、百合

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题型：判断题

“红眼病”是否能通过与他人共用毛巾传染？

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