问题 单项选择题 A1/A2型题

有一位来自林区的患者,主因"发热3天,伴全身肌肉酸痛、头痛、腰痛",以"流行性出血热"收入院。下列有关该病的流行病学特点的描述中不正确的是()

A.鼠类是主要传染源

B.以隐性感染为主

C.发病有明显的地区性和季节性

D.有多种传播途径

E.以青壮年、农民发病为多见

答案

参考答案:B

解析:流行性出血热的传染源主要是啮齿类动物。我国主要的宿主动物和传染源是黑线姬鼠、褐家鼠,林区则主要是大林姬鼠。有多种传播途径,可经呼吸道、消化道、直接接触传播,也可经母婴传播和虫媒传播。人群普遍易感,并以显性感染为主,感染后可获终身免疫。本病广泛流行于亚、欧的许多国家,我国为重疫区。虽全年均可发病,但有明显的高峰季节。其中以黑线姬鼠传播的发病高峰在11月至次年1月,次高峰在5至7月;以褐家鼠传播的发病高峰在3至5月;以大林姬鼠传播的发病高峰在夏季。发病以男性青壮年农民和工人居多。

阅读理解

阅读理解。

     In his 1930 essay "Economic Possibilities for Our Grandchildren ", John Keynes, a famous economist, wrote that human needs fall into two classes: absolute needs ,which are independent of what other have ,

and relative needs ,which make us feel superior to our fellows. He thought that although relative needs may indeed be  insatiable (无止境的) ,this is not true of absolute needs.

    Keynes was surely correct that only a small part of total spending is decided by the desire for

superiority .He was greatly mistaken ,however ,in seeing this desire as the only source of insatiable

demands 

    Decisions to spend are also driven by ideas of quality which can influence the demand for almost all

goods, including even basic goods like food. When a couple goes out for an anniversary dinner, for

example ,the thought of feeling superior to others probably never comes to them. Their goal is to share a

special meal that stands out from other meals.

     There are no obvious limits to the escalation of demands for quality. For example ,Porsche, a famous

car producer, has a model which was considered perhaps the best sport car on the market. Priced at

over $120,000,it handles perfectly well and has great speed acceleration. But in 2004 the producer

introduced some changes which made the model slightly better in handling and acceleration. People who

really care about cars find these small improvements exciting. To get them, however, they must pay almost four times the price.

     By placing the desire to be superior to other at the heart of his description of insatiable demands,

Keynes actually reduced such demands. However, the desire for higher quality has no natural limits.

1. According to the passage, John Keynes Believed that_______.

A. desire is the root of both absolute and relative needs

B. absolute needs come from our sense of superiority

C. relative needs alone lead to insatiable demands

D. absolute needs are stronger than relative needs

2.What do we know about the couble in Paragraph 3?

A. They want to show their superiority

B. They find specialty important to meals

C. Their demands for food are not easily satisfied.

D. Their choice of dinner is related to ideas of quality. 

3. What does the underlined word "escalation" in Paragraph 4 probably mean?

A. Understanding.

B. Increase

C. Difference

D. Study

4.The author of the passage that ______.

A. absolute needs have no limits

B. demands for quality are not insatiable

C. human desires influence ideas of quality

D. relative needs decide most of our spending

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