问题 单项选择题

青枝骨折的X线表现为()

A.骺端有一条状致密白线

B.骺端可见一透亮锐利的线状影

C.骺端与骨骺端分开

D.骺端骨皮质中断

E.骺端骨皮质与骨小梁扭曲折叠

答案

参考答案:E

解析:骨折发生在儿童长骨,由于骨骺尚未与干骺端结合,外力可经过骺板达干骺端而引起骨骺分离,即骺离骨折。由于骨骺软骨不能显影,所以它的骨折线并不能显示,X线片上只显示为骺线增宽或骺与干骺端对位异常。还可以是骺与部分干骺端一并撕脱。在儿童,骨骼柔韧性较大,外力不易使骨质完全断裂,仪表现为局部骨皮质和骨小粱的扭曲,而看不见骨折线或只引起骨皮质发生坟折、凹陷或隆突,即青枝骨折。

单项选择题
阅读理解

阅读理解。

     Children have their own rules in playing games. They seldom need a referee and rarely trouble to keep

scores. They don't care much about who wins or loses, and it doesn't seem to worry them if the game is

not finished. Yet, they like games that depend a lot on luck, so that their personal abilities cannot be directly

compared. They also enjoy games that move in stages, in which each stage, the choosing of leaders, the

picking-up of sides, or the determining of which side shall start, is almost a game in itself.

     Grown-ups can hardly find children's games exciting, and they often feel puzzled at why their kids play

such simple games again and again. However, it is found that a child plays games for very important reasons.

He can be a good player without having to think whether he is a popular person, and he can find himself

being a useful partner to someone of whom he is ordinarily afraid. He becomes a leader when it comes to

his turn. He can be confident, too, in particular games, that it is his place to give orders, to pretend to be

dead, to throw a ball actually at someone, or to kiss someone he has caught.

     It appears to us that when children play a game they imagine a situation under their control. Everyone

knows the rules, and more importantly, everyone plays according to the rules. Those rules may be childish,

but they make sure that every child has a chance to win.

1. What is true about children when they play games?

A. they can stop playing any time they like.

B. They can test their personal abilities.

C. They want to pick a better team.

D. They don't need rules.

2. To become a leader in a game the child has to ________.

A. play well

B. wait for his turn

C. be confident in himself

D. be popular among his playmates

3. What do we know about grown-ups?

A. They are not interested in games.

B. They find children's games too easy.

C. They don't need a reason to play games.

D. They don't understand children's games.

4. Why does a child like playing games?

A. Because he can be someone other than himself.

B. Because he can become popular among friends.

C. Because he finds he is always lucky in games.

D. Because he likes the place where he plays a game.

5. The writer believes that _______.

A. children should make better rules for their games.

B. children should invite grown-ups to plays with them.

C. children's games can do them a lot of good

D. children play games without reasons