新闻背景（或背景材料）

CO中毒患者其皮肤和粘膜可呈（）

A．暗红色

B．鲜红色

C．青紫色

D．樱桃红色

E．紫色

The United States covers a large part of the North American continent. Its neighbors are Canada to the north and Mexico to the south. Although the United States is a big country, it is not the largest in the world. In 1964, its population was over 185,000,000.

When this land first became a nation, after winning its independence (独立) from England, it had thirteen states. Each of the states was represented(代表) on the American flag by a star. All these states were in the eastern part of the continent. As the nation grew toward the west, new states were added and new stars appeared on the flag. For a long time, there were 48 stars. In 1959, however, two more stars were added to the flag, representing the new states of Alaska and Hawaii.

Indians were the first people of the land which is now the United States. There are still

many thousands of Indians now living in all parts of the country. Sometimes it is said that the Indians are "the only real Americans". Most Americans come from all over the world. Those who came first in greatest numbers to make their homes on the eastern coast of North America were mostly from England. It is for that reason that the language of the United States is English and that its culture and customs are more like those of England than those of any other country in the world.

68. The United States didn't have______ states until _____.

A. thirteen; 1959      B. fifty; 1959  

C. fifty; this land first became a nation     D. fifty;1964

69. Why is English the language of America?

A. English is the Indian's native language.     

B. Most Americans come from all over the world.

C. Most of the people who first settled in America were from England

D. Canada is America's nearest neighbor.

70. Which of the following is the best title for the passage?

A. The States of America            B. The Language of America

C. The United States of America      D. The Culture and Customs of America

红十字标志的保护使用，是标示在武装冲突中必须受到尊重和保护的（）。

A.人员和物资

B.人员和设备

C.军队医护人员和红十字人员

什么是静电？静电对人身安全有什么危害？

猪苓抗肿瘤作用有效成分是（）

A、猪苓多糖

B、猪苓酸A

C、猪苓酸C

D、角甾醇

E、以上均非