问题 选择题

2005年10月12日,我国成功发射了“神舟六号”载人航天飞船.火箭升空时表面易产生高温,在火箭表面要涂上一种起散热作用的特殊涂料,该涂料的性质可能是(  )

A.在高温下可分解汽化

B.在高温下能与火箭表面材料反应

C.在常温下就熔化

D.常温下可分解汽化

答案

A、火箭升空时表面易产生高温,高温时容易使火箭损坏,在火箭表面涂上一种在高温下可分解汽化的特殊涂料,能够对火箭起到保护作用.正确;

B、如果该涂料在高温下能与火箭表面材料反应,将会损坏火箭.错误;

C、如果该涂料在常温下就熔化,就不会对火箭升空起到保护作用了.错误;

D、如果该涂料在常温下就分解汽化,就不会对火箭升空起到保护作用了.错误.

故选A.

单项选择题
单项选择题

Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut (1) from the world of books and newspapers, having to (2) on friends to read aloud to them.

A young scientist named Raymond Kurzweil has now designed a computer which is a major (3) in providing aid to the (4) .His machine, Cyclops, has a camera that (5) any page, interprets the print into sounds, and then delivers them orally in a robot-like (6) through a speaker. By pressing the appropriate buttons (7) Cyclops’s keyboard, a blind person can "read" any (8) document in the English language.

This remarkable invention represents a tremendous (9) forward in the education of the handicapped. At present, Cyclops costs $ 50,000. (10) , Mr. Kurzweil and his associates are preparing a smaller (11) improved version that will sell (12) less than half that price. Within a few years, Kurzweil (13) the price range will be low enough for every school and library to (14) one. Michael Hingson, Director of the National Federation for the Blind, hopes that (15) will be able to buy home (16) of Cyclops for the price of a good television set.

Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people have been (17) in those tests, making lots of (18) suggestions to the engineers who helped to produce Cyclops.

"This is the first time that blind people have ever done individual studies (19) a product was put on the market," Hingson said. "Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that (20) , the manufacturers have been the blind ones.

6()

A.behavior

B.expression

C.movement

D.voice