单选题 Foreign propagandists have a strange misconception of our national character. They believe that we Americans must be hybrid, mongrel, undynamic; and we are called so by the enemies of democracy because, they say, so many races have been fused together in our national life. They believe we are disunited and defenseless because we argue with each other, because we engage in political campaigns, because we recognize the sacred right of the minority to disagree with the majority and to express that disagreement even loudly. It is the very mingling of races, dedicated to common ideals, which creates and recreates our vitality. In every representative American meeting there will be people with names like Jackson and Lincoln and Isaacs and Schultz and Kovack and Sartori and Jones and Smith. These Americans with varied. backgrounds are all immigrants or the descendants of immigrants. All of them are inheritors of the same stalwart tradition of unusual enterprise, of adventurousness, of courage--courage to "pull up stakes and git moving". That has been the great compelling force in our history. Our continent, our hemisphere, has been populated by people who wanted a life better than the life they had previously known. They were willing to undergo all conceivable hardships to achieve the better life. They were animated, just as we are animated today, by this compelling force. It is what makes us Americans.

单选题 The title below that best expresses the main idea of this selection is ______.
A. No Common Ideals
B. America's Motivating Force
C. American Immigrants
D. The Evils of Foreign Propaganda

【正确答案】 B

【答案解析】最适合表达本文大意的标题是：美国行为的驱动力。作者在文中指出，正是献身于共同理想的各个种族的融合才创造并重新创造了美国的活力。美国居住着许多想过上比他们以前经历过的更美好生活的人，他们愿意经受所有可以想像的艰难困苦以实现更加美好的生活。正如当今的美国人生机勃勃那样，当时的美国人也被这种动力弄得生机勃勃。这种动力造就了美国人。

单选题 According to the paragraph, our national character thrives because we have ______.
A. immigrant blood B. majority groups
C. been uprooted D. driving ambition

【正确答案】 D

【答案解析】根据这一段，美国的民族繁荣兴旺是因为美国具有策励向上的抱负。作者说，他们的大陆，他们的半球居住着许多想要过上比他们以往经历的更美好生活的人，这实质上是美国人策励向上的抱负。

单选题 Foreign propagandists believe that Americans ______.
A. are enemies of democracy
B. lack a common heritage
C. have a unified national character
D. refuse to argue with each other

【正确答案】 B

【答案解析】外国的一些宣传者认为美国人缺乏共同的传统。第二句是答案B的依据。这句话的意思是：一些外国的宣传者认为美国人是杂种，是混血儿，且缺乏活力，反对民主的人给美国人这样的称谓，因为他们说，美国有许多种族融合在一起。

单选题 Foreign propagandists and the author both agree that Americans ______.
A. are disunited
B. have no common tradition
C. come from varied backgrounds
D. have the courage of their convicitons

【正确答案】 C

【答案解析】外国宣传者和作者一致认为美国人的背景各不相同。第二句和第四句是答案C的依据。