问题 单项选择题

正常小儿血象白细胞分类以中性粒细胞占优势的年龄为

A.生后2~4天前及4~6岁后

B.生后7~10天前及7~10岁后

C.生后15天前及18岁后

D.生后4~6天前及4~6岁后

E.生后30天前及20岁后

答案

参考答案:D

解析:[解题思路] 白细胞分类主要是中性粒细胞比例的变化。出生时中性粒细胞约占0.65,淋巴细胞约占0.30。随着白细胞总数的下降,中性粒细胞比例也相应下降,生后4~6dB寸两者比例约相等;之后淋巴细胞约占0.60,中性粒细胞约占0.35,到4~6岁时两者又相等;7岁后白细胞分类与成人相似。即生后4~6d前及4~6岁后白细胞分类以中性粒细胞占优势,生后4~6d后及4~6岁前白细胞分类以淋巴细胞占优势,4~6d与4~6岁时两者比例相等。

阅读理解

阅读理解。

     At the age of sixty-seven, Shirley Yeats decided to take a trip.Everything was fine until one day the smoke

was coming out of another room on the ship. She phoned the captain (船长) from her room at once and told

him about the fire. Then she went out to see what she could do to help. Later on, she found that the fire

spread (蔓延) very quickly. The captain decided to get all the passengers (乘客) out as quickly as

possible when he saw that.       

     Many of the other passengers were very afraid of that, but Shirley didn't seem scared at all. To many

people's surprise, she didn't go to the lifeboats but help the other passengers instead.

     At last, all one thousand passengers were in the lifeboats and nobody died in the fire. Shirley was one of

the last people to leave. Later she told others, "I was very scared, but I always knew what I had to do. I think

all my years as a teacher helped—all the time telling people what to do and how to do it."

1. The story mainly about _____. [ ]

A. A girl called Shirley Yeats.

B. A fire on the sea.

C. What an old woman teacher did when a fire happened.

2. When Shirley Yeats found the fire, what did she do first?  [ ]

A. She slept in her room.

B. She called the captain and told him about the fire.

C. She went into the lifeboat quickly.

3. Which of the following is TRUE? [ ]

A. Shirley Yeats wasn't scared at all.

B. Shirley was sixty-six.

C. Nobody died in the fire.

4. The underlined word "scared" means _____.[ ]

A. 害怕的

B. 惊奇的

C. 愉快的

5. What do you think of a teacher from the story? [ ]

A. It's a very usual job.

B. A teacher is telling people what to do and how to do it all the time.

C. It's a dangerous job.

问答题 简答题