《安全生产法》提出的“三个必须”，是指管（）必须管安全、管（）必须管安全、管（）必须

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.

机车无火回送时，对制动机应如何处理？

A行政机关和B行政机关认为公民甲从事违法行为，共同对其作出行政处罚决定。甲对处罚决定不服，依法向两机关的上一级行政机关申请复议。复议机关维持了原行政处罚决定。甲向人民法院提起行政诉讼。

甲应以谁为被告提起行政诉讼请回答下列问题：

A．A行政机关

B．B行政机关

C．复议机关

D．国家

直线桥梁自线路中心至作业通道栏杆内侧的净距：混凝土梁桥面应不小于（）m。

A.3.90

B.3.00

C.4.2

D.4.5

行政机关公务员主动交代违法违纪行为，并主动采取措施有效避免或者挽回损失的，应当如何处理