问题 单项选择题

人在学习和工作的时候,会消耗许多营养物质;同时,又会积累许多如乳酸之类的代谢废物,刺激神经,使人产生疲劳感。睡觉是一种生理上的保护现象,人在熟睡时,呼吸会减弱,心率也会减慢,血压和体温也会下降,连肌肉也完全处于松弛状态。总之,身体的一切器官处在低效状态下,既能排泄出白天积累起来的废物,又可降低新陈代谢,养精蓄锐。若不睡眠,让神经细胞一直处于兴奋状态,由于失去的物质得不到及时补偿,神经细胞会大量死亡,人的寿命就会缩短。人若一昼夜不睡觉,就会比一天不吃东西还要难受得多。

专家提醒我们,不睡觉:

A.相当难受
B.影响工作和学习
C.影响新陈代谢,就会影响寿命
D.会吃很多东西

答案

参考答案:C

阅读理解

阅读理解。

                                                                         The Inventions

    Paper was first made in the year 105. It was made by a Chinese named Cai Lun.

    For over 500 years paper was made only in China. People in Japan learned of paper around the year

  600. As years went by, people in other places began to make paper.

    The lead (铅) pencil is not made of lead. It is made of graphite (石墨). People found graphite in 1564.

 They thought it was a kind of lead. Today we still call pencils "lead pencils". The first pencils were made

 by putting strings (线) around sticks of graphite.

    The first wooden pencils were made by Kasper Faber in Germany in 1761.

    Erasers (橡皮) like those we use today were first made in France by a man named Magellan in 1752. It

  was Hyman L. Lipman who first put eraser on the ends of pencils. And that is how the pencils came to

 be.                            

1. How many years earlier was paper made in China than in Japan? 

    A. About 100 years.                

    B. About 400 years.

    C. More than 500 years.            

    D. 495 years 

2. Germans made paper _____.

    A. earlier than Japan                

    B. later than Japan

    C. as early as Japan                

     D. as late as Japan 

3. At first pencils were made of _____.

    A. wood

    B. lead          

    C. sticks

    D. string and graphite

4. Kasper Faber was _____.

    A. an Englishman

    B. a Frenchman

    C. a German

    D. an American 

5. Which of the following statements is NOT true? 

    A. Paper was first made in China.

    B. Graphite isn't a kind of lead.

    C. The first wooden pencils were made in Germany.

    D. Hyman L. Lipman made the first erasers.

单项选择题