问题 单项选择题

影响钙吸收的主要因素是

A.肠道pH

B.年龄

C.性别

D.食物中钙的量

E.肠蠕动加快

答案

参考答案:A

解析:
钙在十二指肠吸收,是在活性D3调节下的主动吸收,肠管的pH可明显的影响钙的吸收,偏碱时减少钙的吸收,偏酸时促进吸收。

阅读理解

阅读理解。

     Jack is my new classmate. He lived in a small village for fifteen years. His father, Mr. Brown, was a rich

farmer. Last year his father opened a shop in our town and last month he bought a big house and Jack began

to study in our class. But Jack had few friends here. At first he often played by himself.

     Jack's neighbor Daisy is a kind girl. She found Jack never talked with anybody and decided to help him.

Jack likes to stay with Daisy and talks to her a lot. Now they're good friends.

     This morning, Daisy said to Jack, "It'll be my sixteenth birthday tomorrow. I'll have a birthday party. Will

you please come?"

      "Certainly!"

      Jack said happily. Jack got home and thought of a present for Daisy. But he forgot to ask Daisy what she

liked. He couldn't call her because he didn't know her telephone number. At that moment Mrs. Brown came

and asked, "What's the matter, dear?"

      "What would you like if it was your sixteenth birthday, Mommy?"

      "Nothing," Mrs. Brown said. "I just wish I were16."

1. Jack's father is a ______ now. [ ]

A. teacher

B. doctor

C. farmer

D. shopkeeper

2. Jack lives in a ______ now. [ ]

A. city

B. town

C. small village

D. small house

3. Jack will go to his ______ birthday party.[ ]

A. mother's

B. father's

C. friend's

D. sister's

4. Jack didn't know ______. [ ]

A. what Daisy looked like

B. Daisy's telephone number

C. The way to Daisy's house

D. when Daisy's party was

5. Jack's mother wanted ______. [ ]

A. some flowers

B. a friend

C. to be young

D. to be healthy

单项选择题