问题 问答题

(4分)小明对妈妈杀鱼时从鱼肚内取出的鳔产生了兴趣,他确定了“探究鳔内气体成分”作为研究性学习的课题。小明通过查阅有关资料获知:这种鱼鳔内氧气约占1/4,其余主要是二氧化碳和氮气。他用医用注射器抽取鳔内气体。现给你两集气瓶的鳔内气体,请你帮助他设计实验验证假设。

 方 法现 象
验证鳔内含O2  
验证鳔内含CO2  
 

答案

根据氧气能助燃,可以用带火星的木条进行检验;二氧化碳可以使澄清石灰水变浑浊.

解答:解:氧气具有助燃的特性,燃着的木条放入瓶中木条可以继续燃烧;二氧化碳可以使澄清石灰水变浑浊.

故答案为:

实验目的方法现象
 将燃着的木条放入含有鱼鳔内气体的集气瓶中木条能继续燃烧
 在含有鱼鳔内气体的集气瓶中加入少量的澄清石灰水石灰水变浑浊

阅读理解

Henry Loomis served as director of the Voice of America for seven years starting in 1958.Mr Loomis played an important role in creating the Special English service .

Henry Loomis was born in 1919 Tuxedo Park , New York. His father was Alfred Lee Loomis , a rich New York City businessman .In 1940, Henry Loomis dropped out of Harvard University to join the United States Navy .He was able to put to good use his knowledge of radar technology that he had learned about because of his father’s work .After graduating at the top in his naval(海军的) training class, Henry Loomis became a teacher at the Navy's radar training school in Hawaii. By the end of World War Two, Henry Loomis had received many honors for his service, including a Bronze Star and an Air Medal. He left the Navy in 1946 to begin graduate(研究生)studies.

Henry Loomis later moved to Washington, D.C. to begin another part of his career in public service. He held positions in the Department of Defense and other agencies: In 1958, he became director of the Voice of America.

During his travels around the world, Mr. Loomis saw that English was becoming an

important international language. He believed that it was important to make English easier to

understand by listeners of VOA broadcasts whose native language was not English. So Mr. Loomis asked VOA program manager Barry Zorthian to develop a way to broadcast to listeners

with a limited knowledge of English:

The result of this effort was Special English: The first Voice of America broadcast in Special English took place on October 19th, 1959. Those against his ideas at the time said the Special English method of broadcasting at a slower rate with a limited vocabulary would never work, it was not practical. American embassies(大使馆) demanded that the program be called off. But Mr. Loomis supported the program.

Soon, VOA began to receive hundreds of letters from listeners praising the program. Special English programs became some of the most popular on VOA. We are pleased to say that our programs still are.

小题1:We can know from the passage that Henry Loomis______.

A.was born in a poor family

B.did well in his naval training class

C.stayed in the Navy for nearly 8 years

D.joined the army immediately after graduating from university小题2:What is the second paragraph mainly about?

A.Henry Loomis's childhood.

B.Henry Loomis's whole business.

C.Henry Loomis's background.

D.Henry Loomis's army life.小题3:What led to Henry Loomis's idea of Special English programs?

A. His experience in the Navy.

B. His experience in the Department of Defense.(国防部)

C. His early dream of promoting the influence of VOA.

D. His finding VOA programs are too difficult for non-native listeners.

小题4:Those who were against his ideas of Special English programs said______

A.Special English programs were not practical

B.it would cost too much to make Special English programs

C.it was unnecessary to broadcast Special English programs

D.Special English programs wouldn't help listeners in improving their English

单项选择题