问题 多项选择题 案例分析题

患儿女,14岁。因左下乳磨牙未脱落替换就诊。左下第一乳磨牙完整无龋坏及松动,牙龈正常,其余口腔内乳牙替换完成。

可能的原因是()

A.左下第一前磨牙先天缺失

B.左下第一乳磨牙固连

C.先天性外胚叶发育不全

D.维生素D缺乏症

E.佝偻病

F.左下第一前磨牙异位萌出

答案

参考答案:A, B, F

阅读理解

阅读理解。

    Country music is very old. It came from the United States, Canada, Ireland and Great Britain. It is a

mixture (混合物) of music from all of these places.

    In the west of America, cowboys had to take care of the cattle (牛). They had to watch them all day

and all night because the cattle were nervous and sometimes ran away. A cowboy's life was lonely and

dangerous. When he was alone in the desert with the cattle, he drank strong coffee to make himself

clear-headed. He sang about the stars and the moon, about his family and his friends to make them quiet.

The cattle listened to the cowboy and went to sleep. They would not run away if he sang beautiful and

peaceful songs.

    In the south of America, many people came from Ireland, Scotland and England. Other people came

from France and Canada. They enjoyed their own kind of music. They used guitars, violins and other

musical instruments, too. They also added instruments from their homes, like bottles and plates. When

they visited their friends and families on holidays, they usually sang and played country music.

1.Which of the statements about country music is TRUE according to the passage? [ ]

A.Country music has a long history.

B.Country music is a mixture of music from the United States, China, Ireland and Great Britain.

C.Country music is a kind of music that comes from a certain country.

D.Country music can be heard only in the country.

2.What was a cowboy's life like? [ ]

A.It was very interesting.

B.It was rich and colorful.

C.It was nervous.

D.It was lonely and dangerous.

3.What did cowboys do to make the cattle quiet? [ ]

A.They drank strong coffee.

B.They sang songs to the cattle.

C.They took care of the cattle.

D.They watched the cattle all day and all night.

4.When did the people in the south of America sing and play country music? [ ]

A.When they had parties.

B.When they celebrated Christmas.

C.When they visited their friends and families on holidays.

D.When they took of the cattle.

5.What's the best title of the passage? [ ]

A.Cowboys

B.Country Music

C.A Cowboy's Life

D.The Cattle

单项选择题