试题与答案

一种筛检乳腺癌的试验用于研究经病理检查证实患有乳腺癌的400例妇女和未患乳腺癌的40

题型:单项选择题

题目:

一种筛检乳腺癌的试验用于研究经病理检查证实患有乳腺癌的400例妇女和未患乳腺癌的400名妇女,结果患癌组有 100例阳性,未患癌组有50例阳性,该试验能将实际无病判定为阴性的能力是

A.100/300=0.33

B.100/400=0.25

C.100/150=0.67

D.50/400=0.125

E.350/400=0.87

答案:

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参考答案:D解析: 在一个群体中为其他人过滤、解释和提供信息的人是意见领袖。

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题型:单项选择题

Ranch. It was near Los Angeles in CaliforniA. A few years later Hollywood was one of the famous places in the world. At the beginning of the 20th century there was a big farm called Hollywood. From the 1910’s to the 1950’s, Hollywood was the film center of the world.

Every family knew the names of its film stars—Charlie Chaplin, Greta Garbo, Bergman and hundreds more.

The reason why people went to Hollywood to make films was the sun. At first, people made films in New York on the east coast of the United States.

But then they heard about Los Angeles, where there are 350 days of the sun every year. As they made all the films by sunlight, the west coast was a much better place to work. Also near Hollywood you can find mountains and sea and desert. They did not have to travel far to make any kind of film.

When TV became popular, Hollywood started making films for television. Then in the 1970’s they discovered people still went to the cinema to see big expensive films. Nowadays they are still making films in Hollywood and people see them all over the world.

In the 1910’s Hollywood became a ().

A.famous theatre

B.good place to have holidays

C.film center

D.home for stars

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