问题 选择题

下列有关元素与人体健康关系的叙述中,错误的是(  )

A.缺钙易患佝偻病或发生骨质疏松

B.缺铁会引起贫血

C.缺锌会引起生长迟缓,发育不良

D.缺碘易患坏血病

答案

A、钙主要存在于骨胳和牙齿中,使骨和牙齿具有坚硬的结构支架,缺乏幼儿和青少年会患佝偻病,老年人会患骨质疏松,所以A正确;

B、铁是合成血红蛋白的主要元素,缺乏会患贫血,所以B正确;

C、缺锌会引起生长迟缓.发育不良,所以C正确;

D、碘是合成甲状腺激素的主要元素,缺乏会患甲状腺肿大,缺少维生素C易患坏血病,所以D错误.

故选D.

阅读理解

The clock struck(敲)eleven at night. The whole house was quiet. Everyone was in bed except me. Under the strong light, I looked sadly before me at a huge pile of that troublesome stuff they call “books”. I was going to have my examination the next day. “When can I go to bed?” I asked myself. I didn’t answer. In fact I dared not(不敢).

The clock struck twelve. “Oh, dear!” I cried. “Ten more books to read before I can go to bed!” We students are the most wretched creatures in the world. Dad does not agree with me on this. He did not have to work so hard when he was a boy.

The clock struck one. I was quite desperate now. I forgot all I had learned. I was too tired to go on. I did the only thing I could. I prayed, “Oh God, please help me pass the exam tomorrow. I do promise to work hard afterwards, Amen.” My eyes were so heavy that I could hardly open them. A few minutes later, with my head on the desk, I fell asleep.

小题1: The underlined word “wretched” in Paragraph 3 probably means ____________.

A.happy

B.disappointed

C.unhappy

D.hopeful小题2: Reviewing his lessons that night didn’t help him because ____________.

A.it was too late at night

B.he was very tired

C.his eyelids were so heavy that he couldn’t keep them open

D.he hadn’t studied hard before the examination小题3: What do you suppose probably happened to the author the next day?

A.He went to a church to pray again.

B.He passed the exam all by luck.

C.He failed in the exam.

D.He was punished by his teacher.小题4: The best title for the passage would be ____________.

A.The Night Before the Examination

B.Working Far into the Night

C.A Slow Student

D.Going Over My Lessons

问答题 简答题