问题 填空题

生活与化学密切相关,以下是生活中常见的物质,请选择恰当物质的序号填空:

①熟石灰②硝酸铵③干冰④甲烷⑤氢氧化钠

(1)可用于人工降雨的物质是______

(2)用于配制波尔多液的是______

(3)溶于水时,能使溶液温度降低的是______

(4)最简单的有机物是______

(5)露置在空气中易潮解的物质是______

答案

(1)干冰气化时要吸热,使周围环境温度降低,可用于人工降雨,故答案为:③;

(2)波尔多液是由硫酸铜、生石灰和水配制成的天蓝色胶状悬浊液,故答案为:①;

(3)硝酸铵溶于水要吸热,所以能使溶液温度降低,故答案为:②;

(4)甲烷是最简单的有机物,故答案为:④;

(5)氢氧化钠暴露在空气中容易吸水潮解,故答案为:⑤.

阅读理解

B

Among the most popular books being written today are science fictions (小说). Hundreds of titles are published every year and are read by all kinds of people. Furthermore, some of the most successful films of recent years have been based on science fiction stories.

It is often thought that science fiction is a fairly new development in literature, but its forefathers can be found in books written hundreds of years ago. These books were often concerned with the presentation of some form of ideal society, a main subject which is still often found in modern stories.

Most of the classics of science fiction, however, have been written within the last one hundred years. Books by writers, such as Jules Verne and H.G. Wells, to mention just two well–known authors, have been translated into many languages.

In an age where science fact frequently overtakes (超过) science fiction, the writers may find it difficult to keep ahead of scientific advances. Those who are clear-sighted to see how the ways are going, however, may provide a valuable lesson on how to deal with the problems which society will unpreventably face as it tries to master its new technology and come to terms with a continually changing view of the world.

45. It can be concluded that modern science fiction ______

A. is worse than that in the past

B. shows the writer’s viewpoints

C. tells stories about men from other planets

D. has been written only by Jules Verne and H.G. Wells

46. From the article we get the impression that science fiction ______.

A. is popular

B. is a fairly new development in literature

C. reflects the technical advances in the past

D. describes things that happen in developed countries

47. Which of the following statements is true?

A. Science fiction is based on successful films.

B. Science fiction often overtakes science fact.

C. Writers may find it easy to keep ahead of scientific advances.

D. The writer who can see clearly the way we are going will give us valuable instructions.

多项选择题