问题 选择题

下列二氧化碳浓度最高的是(  )

A.肺泡

B.组织细胞

C.组织细胞外毛细血管

D.肺泡外毛细血管

答案

生物通过呼吸作用氧化分解有机物为生命活动提供能量;组织细胞的气体交换通过气体扩散完成的,是指血液与组织细胞之间的气体交换,即血液中的氧气扩散到组织细胞中,组织细胞中的二氧化碳扩散到血液中.二氧化碳是由组织细胞氧化分解有机物产生的,气体扩散的原理又是从浓度高的地方想浓度低的地方移动.人体内的气体交换是:肺泡⇌血液⇌组织细胞,从肺泡经过血液进入组织细胞的是氧气,所以氧气浓度最高的是肺泡;从组织细胞经过血液进入肺泡的是二氧化碳,所以二氧化碳浓度最高的是组织细胞处.所以人体内二氧化碳浓度最大的地方是组织细胞.

故选:B.

阅读理解

A Nobel Prize(诺贝尔奖) is considered by most people one of the highest international honors a person can receive. As you know, the prizes were started by a Swede(瑞典人) called Alfred Nobel. He was born in Stockholm, the capital of Sweden. Alfred Nobel was a great scientist. He made two important inventions, and so he became very rich. Although he was rich, Nobel was not a happy man. He never married or had children. Also, he was a sick man during his large part of life. When he died at the age of 63, he left a fund(资金) of $9,000,000. The money was to be used in giving prizes to those who made great achievements in physics, chemistry, medicine and literature(文学), and for world peace.

The first Nobel Prizes were given on December 10, 1901, five years after Nobel’s death. Since then many famous people from all over the world have been given Nobel Prizes for their achievements.

Each prize has three parts. The first part is a gold medal. Second, a winner of a Nobel Prize is given a diploma saying that he has been given the prize. The third part of the prize is a large amount of money-about $40,000.

Often a prize is given to just one person, but not always. Sometimes a prize is shared. It may be given to two or more people who have worked together. It is also sometimes true that a prize is not given at all if there is no great achievement. In 1972, for example, no Nobel Peace Prize was given.

小题1:When was Alfred Nobel born?

A.In 1938.

B.In 1833.

C.In 1896.

D.In 1906.小题2:What kind of person would you say Alfred Nobel was?

A.He was a rich, happy and lucky man.

B.He was a poor, unhappy and unlucky man.

C.He was a rich, but unhappy and unlucky man.

D.He was a poor, but happy and lucky man.小题3:When he died, Nobel left a large amount of money ________.

A.to his wife

B.to his children

C.for helping the poor people in Sweden

D.for setting five prizes小题4:The underlined word “diploma” in the passage most probably means_________ .

A.certificate(证书)

B.letter

C.ticket

D.card小题5:How many persons is a Nobel Prize given to?

A.Not always one person.

B.Two persons.

C.Only one person.

D.Three persons.

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