III. 完形填空：

    Many of the world's pollution problems have been 1    by the crowding of large groups of people into cities．Supply for the 2     of the people leads to 3    pollution by industry．If the 4    increase in human population 5    at the present rate（比率），there may be much greater harm． Some scientists speak of the 6    in number of people as“population pollution．”

  About 2000 years ago，the world 7   was probably about 250 million． 8    reached a billion in 1850．By 1930the population was two billion．It is 9      six and a half billion．It is 10    to double by the year 2050．If the population continues to grow at the same 11    ， there would be 25 billion people in the world a hundred years from now．

  Man has been using the earth's 12    more and more rapidly over the years．Some of them are almost 13    ．Now many people believe that man's greatest 14    is how to control the growth of his population．The 15    in the world will not support the human population，in time to come，if the 16    rate of increase continues． 17    there is over crowding in the 18    and hunger in some countries． Can man's rate of increase 19    ？Many people believe that human survival（继续生存）in the future depends on the answer 20    the question．

1．A．made  B．caused      C．led    D．worked out

2．A．needs  B．satisfies    C．service      D．lacks

3．A．farther       B．less   C．further      D．better

4．A．harmful      B．small C．slow  D．rapid

5．A．stops   B．continues  C．slows down      D．adds to

6．A．increase      B．reduce      C．quality      D．quantity

7．A．people B．situation   C．population       D．land

8．A．They   B．You   C．We    D．It

9．A．now    B．in the past C．in the future     D．then

10．A．hoped  B．expected   C．wished   D．looked forward to

11．A．time  B．year  C．rate   D．period

12．A．place B．oil     C．mines       D．resources

13．A．missed      B．rich   C．gone  D．enough

14．A．problem   B．power       C．plan  D．idea

15．A．food  B．electricity C．energy      D．materials

16．A．past   B．present     C．future       D．slow

17．A．Already    B．Yet    C．Still  D．Often

18．A．villages    B．mountains C．cities D．farms

19．A．continue   B．exist  C．fall    D．keep

20．A．in     B．of     C．to      D．for

I passed all the other courses that I took at my University，but I could have never passed botany（植物学）．This was because all botany students had to spend several hours a week in a laboratory looking through a microscope（显微镜）at plant cells，and I could never once see a cell through a microscope．This used to make my professor angry．He would wander around the laboratory pleased with the progress all the students were making in drawing the structure（结构）of flower cells，until he came to me．I would Just be standing there． “I can’t see anything，”I would say．He would begin patiently enough, explaining how anybody can see through a microscope，but he would always end up angrily．claiming that I could too see through a microscope but just pretended that I couldn’t． “It takes away from the beauty of flowers anyway” I used to tell him．”We are not concerned with beauty in this course． “he would say．”We are concerned with the structure of flowers．”“Well，”I'd say．”I can’t see anything．” “Try it just once again．”he'd say，and I would put my eye to the microscope and see nothing at all，except now and again something unclear and milky．”You were supposed to see a clear，moving plant cells shaped 1ike clocks．”“I see what looks like a lot of milk．”I would tell him．This，he claimed，was the result of my not having adjusted the microscope properly，so he would readjust it for me，or rather，for himself．And I would look again and see milk．

    I failed to pass botany that year，and had to wait a year and try again，or I couldn’t graduate．The next term the same professor was eager to explain cell一structure again to his classes． “Well，”he said to tile．happily．”we're going to see cells this time，aren't we?” “Yes，sir，”I said．Students to the right of me and to the left of me and in front of me were seeing cells；what’s more，they were quietly drawing pictures of them in their notebooks．Of course．I didn't see anything．

    So the professor and I tried with every adjustment of the microscope known to man．With only once did I see anything but blackness or the familiar milk，and that time I saw， to my pleasure and amazement，something 1ike stars．These I hurriedly drew．The professor，noting my activity，came to me，a smile on his lips and his eyebrows high in hope．He looked at my cell drawing． “What’s that?” he asked．“That’s what I saw，”I said．”You didn’t，you didn’t，you didn’t!” he screamed，losing control of himself immediately，and he bent over and looked into the microscope．He r8ised his head suddenly．”That’s your eye!”．he shouted．”You’ve adjusted the microscope so that it reflects! You've drawn your eye!”

     ——Selected from University Days by James Thurber

1．Why couldn't the writer see the flower ceils through the microscope?

      A．Because he had poor eyesight．

      B．Because the microscope didn’t work properly．

      C．Because he was not able to adjust the microscope properly．

      D．Because he was playing jokes on his professor by pretending not to have seen it．

2．Why does the writer mention “Students to the right of tile and to the left of rile and in front of me were seeing cells” in Paragraph 2?

      A．To express his professor's satisfaction with his classmates．

      B．To prove his professors excellent teaching ability in his class．

      C．To show more clearly his not seeing the cells by comparing them with himself．

      D．To suggest his classmates' gift for drawing pictures，

3．What does the writer mean by “his eyebrows high in hope” in the last paragraph?

    A．His professor expected him to have seen the cells and drawn the picture of then,．

    B．His professor hoped he could perform his task with attention．

    C．His professor wished him to learn how to draw pictures．

    D．His professor looked forward to seeing all his students finish their drawings．

4．What is the thing like stars that the writer saw in the last paragraph?

A．Real stars．                                            B．His own eye． 

C．Something unknown．                               D．Milk

5．In what writing style did the writer write the passage?

      A．Realistic．                                              B．Romantic．

       C．Serious．                                               D．Humorous．

Many of the world's pollution problems have been 1　 by the crowding of large groups of people into cities．Supply for the 2　　 of the people leads to 3　 pollution by industry．If the 4　 increase in human population 5　 at the present rate，there may be much greater harm． Some scientists speak of the 6　 in number of people as“population pollution．”

About 2000 years ago，the world 7　 was probably about 250 million． 8 　reached a billion in 1850．By 1930the population was two billion．It is 9　 three and a half billion．It is 10　 to double by the year 2005．If the population continues to grow at the same 11　 ， there would be 25 billion people in the world a hundred years from now．

Man has been using the earth's 12　 more and more rapidly over the years．Some of them are almost 13　 ．Now many people believe that man's greatest 14　 is how to control the growth of his population．The 15　 in the world will not support the human population，in time to come，if the 16　 rate of increase continues． 17　 there is over crowding in the 18　 and hunger in some countries． Can man's rate of increase 19　 ？Many people believe that human survival in the future depends on the answer 20　 the question．

1．A．made　　 B．caused　　　　 C．led　　　　　 D．worked out

2．A．needs　　 B．satisfies　　 C．service　　　 D．lacks

3．A．farther　 B．less　　　　　 C．further　　　 D．better

4．A．harmful　 B．small　　　　 C．slow　　　　　 D．rapid

5．A．stops　　 B．continues　　 C．slows down　　 D．adds to

6．A．increase B．reduce　　　　 C．quality　　　 D．quantity

7．A．people　 B．situation　　 C．population　　 D．land

8．A．They　　 B．You　　　　　 C．We　　　　　　 D．It

9．A．now　　　 B．in the past　 C．in the future D．then

10．A．hoped　 B．expected　　　 C．wished　　　 D．looked forward to

11．A．time　　 B．year　　　　　 C．rate　　　　　 D．period

12．A．place　 B．oil　　　　　 C．mines　　　　 D．resources

13．A．missed　 B．rich　　　　　 C．gone　　　　　 D．enough

14．A．problem B．power　　　　 C．plan　　　　　 D．idea

15．A．food　　 B．electricity　 C．energy　　　　 D．materials

16．A．past　　 B．present　　　 C．future　　　　 D．slow

17．A．Already B．Yet　　　　　 C．Still　　　　 D．Often

18．A．villages B．mountains　　 C．cities　　　　 D．farms

19．A．continue B．exist　　　　 C．fall　　　　　 D．keep

20．A．in　　　 B．of　　　　　　 C．to　　　　　　 D．for