急性乳突炎多由急性化脓性中耳炎发展而来，它更常见于哪种类型的乳突（） A.气化型乳突

阅读理解。

     A young woman was walking through a supermarket to pick up a few things when she noticed an old

man following her around. Thinking nothing of it, she ignored him and went on shopping. After she got

what she wanted, she went to checkout line, but the old man got in front of her.

     "Pardon me." he said, "I'm sorry if my staring (盯) at you has made you feel uncomfortable, it's just

because you look like my granddaughter, who just died recently. And I miss her very much."

     "I'm very sorry," replied the young woman. "Is there anything I can do for you?"

     "Yes." the old man said. "As I'm leaving, can you say 'Good-bye, grandpa' to me? It would make me

feel so much better."

     "Sure," answered the young woman.

     As the old man was leaving, she called out. "Bye-bye, grandpa!"

     When she stepped up to the checkout counter (收银台), she saw that her total was $178.50.

     "How can that be?" she asked. "I only bought a few things!"

     "Your grandpa said you would pay for him," said the clerk.

1. Why did the old man follow the woman and let her say "Bye-bye, Grandpa"?

A. He wanted to steal her money.

B. She looked like her dead granddaughter.

C. He wanted to stare at her.

D. He wanted her to pay for him.

2. According to the passage we can know that _____.

A. the young woman is a careless person

B. the young woman is as clever as the old man

C. the young woman was pleased to pay for the old man

D. the young woman didn't know the old man at all 

3. What does the word "ignored" mean?

A. 忽视

B. 浏览

C. 可怜

D. 鄙视

4. How much did it cost that the young woman bought?

A. More than $178.50.

B. Less than $178.50.

C. About $178.50.

D. $ 78.50.

5. Which of the following is the best title of the story?

A. A kind hearted young woman.

B. The total was $178.50.

C. Bye-bye grandpa

D. An old man and his granddaughter.

病人在出现明显症状以前，X线片就能显示转移的是（）

A.鼻咽癌

B.乳腺癌

C.肾癌

D.前列腺癌

E.胃癌

有些部门为了提高安全性，安装了眼角膜识别门禁系统，这是使用了（）。

A.语音技术

B.多媒体技术

C.模式识别技术

D.虚拟现实技术

Bowen病的发生与下列哪些因素有关，除了（）

A.长期接触砷剂

B.长期曝晒

C.不洁性接触

D.HPV-5感染

催化裂化与热裂化的反应机理有何不同？