根据字符所联系的语言单位来看，现代汉字属于（）。

地方性氟病的主要临床表现是（）和（）。

Mark was walking home from school one day when he noticed the boy ahead of him had stumbled over something and dropped all of the books he was carrying along with two sweaters, a baseball bat, a glove and a small tape recorder. Mark knelt down and helped the boy pick up the scattered articles. Since they were going the same way, he helped to carry part of the burden. As they walked Mark discovered the boy’s name was Bill, that he loved video games, baseball and history, and  that he was having lots of trouble with his other subjects and that he had just broken up with his girlfriend.

They arrived at Bill's home first and Mark was invited in for a Coke and to watch some television. The afternoon passed pleasantly with a few laughs and some shared small talk, then both graduated from junior high school. They ended up in the same high school where they had brief contacts over the years. Finally the long awaited senior year came and three weeks before graduation, Bill asked Mark if they could talk.  

Bill reminded him of the day years ago when they had first met. "Did you ever wonder why I was carrying so many things home that day?" asked Bill. "You see, I cleaned out my locker because I didn't want to leave a mess for anyone else. I had stored away some of my mother's sleeping pills and I was going home to commit suicide. But after we spent some time together talking and laughing, I realized that if Ihad killed myself, I would have missed that time and so many others that might follow. So you see, Mark, when you picked up those books that day, you did a lot more. You saved my life.”

小题1:The underlined word “stumbled” in Paragraph One probably means    .

A．stopped himself

B．came to life

C．trapped himself

D．lost one’s balance小题2: It can be inferred that________ according to the passage.

A．The boy took so many books with him because he was about to take an exam soon.

B．From the beginning, in fact, Mark knew Bill was to kill himself.

C．Bill valued the days whenthey spenttalkingandlaughing together

D．Bill was dismissed for his breaking the school rules小题3:What was it that saved Bill’s life in fact?

A．Friendliness and kindness.

B．Understanding and Honesty.

C．Bill’s confidence and strong will

D．Bill’s mother’s encouragement小题4: From the passage we can learn that    _____.

A．Bill would have remove to another school if Mark hadn't met him that day

B．Bill had planned to go to kill himself for the loss of his girlfriend.

C．From the first meeting, they often talked and play together.

D．Mark found out Bill’s secret and saved his life.小题5:Which of the following should be the best title for this passage?

A．A little but meaning thing

B．Just a Little Smile

C．Unforgettable School Life

D．Friendship and Life

首期投资和回收周期如何，设备寿命如何？

直流电源线正极外皮颜色应为（）色。

A.红色

B.蓝色

C.黑色

D.黄绿色

女性，45岁。新诊断糖尿病，用胰岛素治疗后第5天，血糖从原来甚高很快降至接近正常水平，但突然发生视力模糊，应首先考虑可能是由于（）

A.已有白内障

B.视网膜微血管病变

C.合并青光眼

D.晶体渗透压改变

E.玻璃体出血