问题 选择题

人体肌肉组织中的红白肌比例,主要是遗传决定的.肌肉组织具有的功能是(  )

A.收缩、舒张等

B.产生和传导兴奋

C.支持、连接、保护、营养等

D.保护身体表面免受外在环境的伤害和感染

答案

肌肉组织主要由肌细胞构成,具有收缩、舒张功能.如心肌、平滑肌、骨骼肌,在屈肘动作时.肱二头肌收缩.肱三头肌舒张,伸肘时肱二头肌舒张,肱三头肌收缩,因此肌肉组织具有的功能是收缩、舒张.

故选:A

单项选择题
阅读理解

All over the world people enjoy sports.Sports help to keep people healthy,happy and help them to live longer.

Sports change with the season. People play different games in winter and summer.

Games and sports often grow out of people’s work and everyday activities.The Arabs use horses or camels in much of their everyday life;they use them in their sports,too.

Some sports are so interesting that people everywhere go in for them.Football,for example,has spread around the world.Swimming is popular in all countries near the sea or in those with many rivers.

Some sports or games go back to thousands of years,like running or jumping.Chinese boxing,for example,has a very long history.But basketball and volleyball are rather new.Neither one is a hundred years old yet.People are inventing new sports or games all the time.

People from different countries may not be able to understand each other but after a game they often become good friends.Sports help to train a person's character(性格).One learns to fight hard but fight fair,to win without pride and to lose with grace(体面)

小题1:The writer didn't tell us in this passage that________.

A.basketball was invented in America

B.sports change with the season

C.games and sports often grow out of people’s work and everyday activities

D.football is played all over the world小题2:People all over the world enjoy sports because_______.

A.sports are interesting

B.sports help to keep people healthy,happy and to live longer

C.sports help to train one’s character

D.all of the above小题3:From this passage we can see that _____.

A.sports and games are unimportant things that people do

B.sports and games should be treated(对待)only as amusement(娱乐活动)

C.sports and games are only useful to the old

D.none of the above is true