下图是甲、乙、丙三企业产品成本及其构成比较：在成本结构中，材料费所占的比重（） A．

阅读理解 。

     Perhaps the only test score that I remembered is the 55 when I was in high school.

     The test was the final for a course. I remembered waiting anxiously as my teacher Mr. Right passed out our papers one by one. It was a rather difficult

test. I heard my classmates groaning, and I could tell by the groans that the

scores weren’t looking good.

     Mr. Right put my paper on my desk. There in big red numbers, circled to

draw attention, was my score, 55!

     I lowered my head, and covered the score up quickly. A 55 is not

something that you wanted your classmates to see. “The scores were not

very good, none of you passed,” Mr. Right said. “The highest score in the

class was a 55.”

     A 55. That’s me!

     Suddenly my sad look didn’t look so bad. I had the highest score. I felt a lot better.

     I walked home alone that day with the low but high score. My father knew that I had a big test that day and asked me as soon as I got home, “How did

you do in your test?” “I made a 55,” I said.

     A frown(皱眉) now stood on my father’s face. I knew I had to explain

immediately. “But Dad, I had the highest score in the class, ” I proudly

stated. I thought that explanation would make a difference. “You failed!” my father replied. “But it’s the highest!” I insisted. “I don’t care what scores others had, but you failed. What matters is what you do!” my father

firmly said.

     For years, my father was always that way. It didn’t matter what others

did, it only mattered what I did and that I did it excellently.

     We often don’t understand the wisdom（智慧）of good parents until

we ourselves stand in the parents’ shoes. My father’s words have carried me throughout life.

1. The word “groaning” is the closest in meaning to      .

A. singing        

B. laughing      

C. complaining  

D. quarreling

2. In class, to hide my score from my classmates, I        .

A. lowered my head                

B. covered my score up

C. walked home alone              

D. explained immediately

3. A frown stood on my father’s face because he thought     .

A. I did a bad job in the test          

B. I gave a good excuse

C. I became the worst student        

D. I stood in his shoes

4. We can infer from the passage that         .

A. the father was strict with his child

B. the writer was always poor in tests

C. Mr. Right was worried about the writer

D. the writer was always happy with his scores

5. Which is the best title of the passage?

A. The Final Test                  

B. That’s Me!

C. My Strict Teacher                

D. Scores, Important?

某女性，纺织女工，年龄45岁。经检查听阈提高20dB，10～20小时后恢复听力，属何种类型听力损害（）

A.噪声性耳聋

B.听觉适应

C.听觉疲劳

D.噪声性听力损伤

E.暂时性听力下降

热心公益，服务社会是 [ ]

A．志愿者的责任

B．为了让更多的人关注你

C．为了承担社会责任、帮助他人、提升自身价值

D．别人对我的希望

下列定金的性质中，( )起到督促当事人履行合同，确保债权人利益的作用。

A．证约性质
B．预先给付的性质
C．担保性质
D．补偿性质

什么叫应激？影响健康的应激源有哪些？