问题 选择题

①②③④表示人体的四条血管。正常人在一天24小时之内,血糖浓度最稳定和波动幅度最大的血管分别是(   )

A.②④

B.④③

C.④②

D.①②

答案

答案:C

题目分析:因为肝脏分泌的胆汁只能乳化脂肪,而且不能吸收营养物质,对葡萄糖不起任何作用,所以④内血糖浓度最稳定,小肠是营养物质消化和吸收的主要场所,葡萄糖在小肠被吸收,所以经过小肠出的血管②内血糖浓度波动幅度最大。

点评:此题难度较大,对于消化系统的组成以及消化器官的特点,可结合着消化系统的结构示意图掌握。

阅读理解

阅读理解

     We walked in so quietly that the nurse at the desk didn't even lift her eyes from the book. Mum

pointed at a big chair by the door and I knew she wanted me to sit down. While I watched mouth

open in surprise,  Mum took off her hat and coat and gave them to me to hold. She walked quietly to

the small room by the lift and took out a wet mop. She pushed the mop past the desk and as the nurse

looked up, Mum nodded and said, "Very dirty floors. "

      "Yes, I'm glad they've finally decided to clean them, "the nurse answered. She looked at Mum

strangely and said, "But aren't you working late?"

    Mum just pushed harder, each swipe(拖一下)of the mop taking her farther and farther down the hall.

I watched until she was out of sight and the nurse had turned back to writing in the big book.

    After a long time Mum came back. Her eyes were shining. She quickly put the mop back and took my

hand. As we turned to go out of the door, Mum bowed politely to the nurse and said, "Thank you."

    Outside, Mum told me, "Dagmar is fine. No fever. "

    "You saw her, Mum?"

     "Of course. I told her about the hospital rules, and she will not expect us until tomorrow. Dad will stop worrying as well. It's a fine hospital. But such floors! A mop is no good. You need a brush."

1. When she took a mop from the small room what Mum really wanted to do was____.

A. to clean the floor  

B. to please the nurse

C. to see a patient  

D. to surprise the story-teller

2. When the nurse talked to Mum she thought Mum was a________

A. nurse  

B. visitor

C. patient  

D. cleaner

3. After reading the story what can we infer about the hospital?

A. It is a children's hospital. 

B. It has strict rules about visiting hours. 

C. The conditions there aren't very good.

D. The nurses and doctors there don't work hard.

4. From the text we know that Dagmar is most likely____________

A. the story-teller's sister   

B. Mum's friend

C. the story-teller's classmate

D. Dad's boss

5. Which of the following words best describes Mum?

A. strange

B. warm-hearted

C. clever  

D. hard-working

问答题 简答题