问题 单项选择题

心脏的搏动引起血液循环。对同一个人,心率越快,单位时问进入循环的血液量越多。血液中的红血球运输氧气。一般的说,一个人单位时间内通过血液循环获得的氧气越多,他的体能及其发挥就越佳。因此,为了提高运动员在体育比赛中的竞技水平,应该加强他们在高海拔地区的训练,因为在高海拔地区,人体内每单位体积血液中含有的红血球数量,要高于在低海拔地区。 以下哪项是题干的论证必须假设的( )

A.海拔的高低对运动员的心率不发生影响

B.运动员的心率比普通人慢

C.在高海拔地区训练能使运动员的心率加快

D.运动员在高海拔地区的心率不低于在低海拔地区

答案

参考答案:D

解析: D项是题干的论证必须假设的,否则,如果事实上运动员在高海拔地区的心率低于在低海拔地区,那么即使在高海拔地区,人体内每单位体积血液中含有的红血球数量,要高于在低海拔地区,但由于心率较慢,单位时间进入循环的血液量较少,因而单位时间里血液中运输氧气的红血球并不见得就多,因而通过血液循环获得的氧气并不见得就多,因而在高海拔地区训练的运动员的体能及其发挥并不能较佳。A项的断定过强,不是题干的论证必须假设的。假如,如果事实上海拔越高,运动员的心率越快,即A项的断定不成立,但题干的论证并不因此不成立。C项能加强题干的论证,但同样不是题干的论证必须假设的。B项也不是题干的论证必须假设的。

单项选择题 B1型题
阅读理解

阅读理解。

     What brings a nation together? Of the four choices - shared values, language, history, and religion, it's shared values. In our latest poll (民意调査), seven out of 16 countries chose values as the greatest factor (因索)bringing a nation

together, and six preferred language. Both choices scored high in the poll, suggesting that our values and how we

express them are closely linked Still, history was not forgotten in some countries, particularly in Mexico and Russia.

Even Canada and the United States chose national histories as the second-most important factor uniting their people.

The biggest surprise? Not one country picked religion as its top choice. 

     Respect your elders

     In most countries, the oldest

generation considered values more important to a nation than did those who are under 45 years old.

     Do you speak Canadian?

     Language scored lower in Canada than in all other countries polled, perhaps because the country speaks two

official languages, French and English.

      Church and state

      Most people polled do not connect their religious beliefs to their national pride. Religion ranked last in

13 countries - with France scoring it at 1%, the lowest of all.

1. According to the poll, what was the most important factor in bringing a nation together?

A. Language.        

B. Values.        

C. History.        

D. Religion.

2.In which country did language score the lowest in their national pride?    

A. Canada.          

B. Mexico.        

C. France.          

D. America.

3.According to the charts, shared values and language were considered equally important in             .  

A. Australia      

B. Brazil         

C. China            

D. India