问题 填空题

如图是关节的一般结构图,请据图回答:

①关节既灵活又牢固.关节灵活是由于[______]______光滑,上面还有一层既光滑又有弹性的[______]______;[______]______内层能分泌滑液,均可减少摩擦.

②关节牢固是因为关节外面包绕着由致密结缔组织构成的[______]______和______.

答案

关节是指骨与骨之间能够活动的连接,由关节面、关节囊和关节腔三部分组成.由关节结构图可知:[1]关节面,[2]关节囊,[3]关节腔,[4]关节软骨.

关节面:是两个(或两个以上)相邻骨的接触面,其中略凸起的一面叫做关节头,略凹进的一面叫做关节窝.关节面上覆盖一层表面光滑的关节软骨,可减少运动时两骨间关节面的摩擦和缓冲运动时的震动.

关节囊:由结缔组织构成,包绕着整个关节,把相邻的两骨牢固地联系起来.囊壁的内表面能分泌滑液.在关节囊及囊里面和外面还有很多韧带,使两骨的连接更加牢固.

关节腔:由关节囊和关节面共同围成的密闭腔隙,内有少量滑液.滑液有润滑关节软骨的作用,可以减少骨与骨之间的摩擦,使关节的运动灵活自如.

使关节运动灵活的结构特点是:关节面上覆盖一层表面光滑的关节软骨,和关节囊的内表面还能分泌滑液,可减少运动时两骨间关节面的摩擦和缓冲运动时的震动.

使关节牢固的结构特点是:关节囊包绕着整个关节,把相邻的两骨牢固地联系起来.在关节囊及囊里面和外面还有很多韧带,使两骨的连接更加牢固.

故答案为:①1;关节面;4;关节软骨;2;关节囊;②2;关节囊;关节囊里面、外面的韧带,起加固作用.

阅读理解

Television, which made its first serious appearance in 1939, did not become common until the early 1950s.Since then, millions of children have grown up in front of the set, and many people now worry about the effect that TV has on the young, and on society in general.Educators, psychologists, and crime experts wonder if television should be abolished(取消).Many ordinary parents wish it had never been invented.Why are they so afraid? Is television as harmful as they think it is?

Like almost anything else, television has its good and its bad sides.One should surely thank its inventors for the joy and interest that they have brought into the lives of the old, the sick, and the lonely -- all those who, without it, would have no pleasure and no window on the world.

In truth, television has opened windows in everybody's life.No newspaper has ever reached so many people and shown so clearly what was happening right now in their own country and everywhere else.TV not only gives the news instantly, it also shows it in pictures more powerful than words.It can be said that TV has brought reality to the public.Millions of people now have seen the effects of a battle, a flood, a fire, a crime, disasters of every sort on the screen.

Unfortunately, television's influence has been extremely harmful to the young.Children do not have enough experience to realize that TV shows present an unreal world.They want to imitate what they see.They do believe that the violence they see is normal and acceptable.By the time they are out of high school, most young people have watched about 15,000 hours of television, and have seen about 18,000 killings or other acts of violence.All educators and psychologists agree that the "television generations" are more violent than their parents and grandparents,

According to the same experts, the young are also less patient.Used to TV shows, where everything is quick and entertaining, they do not have the patience to read an article without pictures; to read a book that requires thinking; to listen to a teacher who doesn't do funny things like the people on children's programs.And they expect all problems to be solved happily in ten, fifteen or thirty minutes.That's the time it takes on the screen.

It is certain that television has deeply changed our lives and our society.It is certain that, along with its benefits, it has brought many serious problems.To these problems we must soon find a solution because, whether we like it or not, television is here to stay.

小题1:First TV set was made ______.

A.in 1939

B.in 1950s

C.in 1940s

D.in 1919小题2:Which of the following people have a view on TV different from the others?

A.Educators.

B.TV producers.

C.Crime experts.

D.Psychologists.小题3:According to the author, who need TV most?

A.Educators.

B.Crime experts.

C.The old and the lonely.

D.The children and their parents.小题4:We can conclude that ‘television generations’ are_______.

A.lonely

B.more patient

C.more violent

D.more gentle

单项选择题 B1型题