问题 单项选择题

关于出生后造血,不正确的是

A.淋巴器官产生淋巴细胞

B.出生后红细胞、白细胞、血小板均由骨髓产生

C.5~7岁以下幼儿几乎全部骨髓参与造血活动即为红髓

D.长骨骨髓腔为脂肪细胞所代替称为黄髓,即失去造血功能

E.正常情况下,成人主要的造血器官是骨髓

答案

参考答案:C

解析:5岁以下幼儿几乎全部骨髓参与造血活动即为红髓。

阅读理解

阅读理解。

    A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm

welcome and then kindly asked the other passengers to make more room for the woman and her child. On

seeing this,people began to talk. "You know this conductor used to be very rude. Now Suddenly he has

changed his bad behavior," said a middle-aged man. 

    "Yes. He should be praised and we must write a letter to the company," said a second passenger. "That's

right." another lady said, "I wish a newspaper reporter were here so that more people could learn from this

conductor."

    Just then a gentleman who looked like a teacher turned to the conductor and said, "Excuse me, but can

I know your name, please? Your excellent service must be praised…"

    Before he could open his mouth, the three-year old child sitting on the young woman's lap interrupted.

"I know his name. I call him Dad."

1. One passenger suggested writing a letter to the company to _____. [ ]

A. make a demand for more buses

B. thank the conductor for his good service

C. criticize (批评) the conductor for his rude behavior

D. invite a newspaper reporter to write about the conductor

2. The word "him" in the last paragraph refers to _____.

[ ]

A. the gentleman

B. the conductor

C. the middle-aged man

D. the three-year-old child

3. It is clear from the story that the conductor _____. [ ]

A. has changed his attitude (态度) towards his work

B. has now been kind and polite to all passengers

C. has not changed his rude behavior to passengers

D. has now been kind and polite to women with children

单项选择题