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问题 单项选择题 A1型题

1岁以内婴儿心脏的左界在（）

A.左乳线内0.5～1.0cm

B.左乳线内1.0～1.5cm

C.左乳线上

D.左乳线外1cm

E.左乳线外1～2cm

答案

参考答案：E

解析：叩心界可估计心脏大小、形状，3岁以内婴幼儿一般只叩心脏左界。通常1岁以内小儿心脏左界在左乳线外1～2cm，2～5岁在左乳线外1cm，5～12岁在左乳线上或乳线内0．5～1cm，12岁在左乳线内0．5～1cm。

阅读理解

阅读理解。   

     My name is Bruce. I'm a boy. I'm from Canada. I live in Beijing now. This is my friend. His name is

Jack. He is in Beijing, too. But he isn't in my school. He is my good friend. Look, that boy is Tom and

that girl is Mary. Tom and Mary are my friends. I have a book in my hand. I borrow this book from the

library. I like books!

根据短文内容，选择正确答案。

1. Bruce lives in ________.

A. Canada

B. China  

C. England

D. America

2. Jack is a ________.

A. girl  

B. teacher  

C. boy  

D. cat

3. Bruce has ________ friends.

A. one  

B. two

C. three

D. four

4. Bruce has a ________ in his hand.

A. pen

B. book

C. pencil

D. marker

5. The book is from ________.

A. my school

B. Tom  

C. Mary

D. the library
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单项选择题

设有关系R，S和T如下。关系T是由只和S经过什么操作得到的
R

A B C
1 2 3
4 1 6
3 2 4
S
A B C
4 1 6
2 7 1
T
A B C D E
1 2 3 7 1
3 2 4 7 1
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