冻疮的主要致病因素是指：A．寒邪外袭，耗伤阳气B．气血衰弱，寒邪侵袭C．元气虚弱，不

生产性粉尘的危害程度与下列＿因素无关。

A.理化性质

B.生物学作用

C.防尘措施

D.地域

阅读理解。

    Last summer vacation, I volunteered to work at a vet's(兽医诊所). There I saw a lot of dogs. Minnie

was the funniest-looking dog I'd ever seen. Short thin curly hair covered her sausage-shaped(香肠形)

body. Her eyes always seemed surprised. And her tail looked like a mouse's tail.

    She was brought to the vet because her owners didn’t want her any more. I thought Minnie had a

sweet personality, though. "No one should judge her by her looks," I thought. Finally, I advertised Minnie

in the local paper. "Funny-looking dog, well-behaved, needs a loving family."

    When a boy called, I warned him that Minnie was strange-looking. The boy on the phone told me that

his grandfather’s sixteen-year-old dog had just died. They wanted Minnie no matter what. I gave Minnie

a good bath. Then we waited for them to arrive. At last, an old car stopped in front of the vet's. Two kids

ran to the door. They picked Minnie up and rushed her out to their grandfather, who was waiting in the

car. I hurried behind them to see his reaction to Minnie. Inside the car, the grandfather held Minnie in his

arms and stroked her soft hair. She licked(舔)his face. Her tail wagged around so quickly that it looked

like it might fly off her body.

     "She's perfect!"the old man said happily.

     I was thankful that Minnie had found a good home.

     Suddenly, I saw that the grandfather’s eyes were a milky white colour-he was blind.

1. Why did the writer advertise Minnie in the local newspaper? Because__________.

A. he wanted to sell her at a good price  

B. he didn’t want her any more, either

C. he wanted to find a family for her    

D. he wanted to have another dog

2. Which is the right order according to the passage?

1. A boy called the writer.              2. The writer went to the vet’s.  

3. Minnie was taken by two kids to a car.  4. The writer advertised in a paper.

5. The writer found Minnie.

A. 1-2-3-4-5    

B. 2-4-5-3-1    

C. 1-3-4-2-5    

D. 2-5-4-1-3

3. The underlined word "stroked" may mean__________.

A. touched something gently    

B. cut something quickly 

C. colour something beautifully    

D. pull something out hard

4. Which of the following is TRUE?

A. Minnie wasn’t the type of dog the old man loved.

B. The old man couldn’t see how funny Minnie looked.

C. Minnie knew very well how to make others dislike her.

D. Minnie was like the old man’s dog which had just died.

电工仪表按照读数方式，可以分为（）仪表。

A.指针式

B.光标式

C.数字式

D.比较式

能使蛋白质沉淀而不变性的沉淀剂和温度（）

A.低温下用硫酸铵

B.常温下用硫酸铜

C.常温下用三氯醋酸

D.低温下用丙酮或乙醇

E.低温下用三氯醋酸

三熊足砚