Many people believe the glare（炫目的光）from snow causes snowblindness. Yet, with dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness ,when exposed to several hours of“ snow light”.

　　The United States army has now determined that glare from snow does not cause snowblindness in troops in a snow -covered country. Rather ,a man’s eyes frequently find nothing to focus on （聚集） in a broad space of snow- covered without- grass land. So his gaze continually moves and jumps back and forth over the entire landscape in search of something to look at. Finding something, hour after hour, the eyes never stop searching and the eyeballs become tired and the eye muscles ache. Nature makes up for this discomfort by producing more and more fluid （流 体） which covers the eyeball. The fluid covers the eyeball in increasing quantity until it makes eyes difficult to see dearly, and the result is total, even though for a short time, snowblindness.

　　Experiments led the Army to a simple method of overcoming this problem. Scouts（侦察兵）ahead of the troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow - covered landscape. Even the scouts themselves throw lightweight, dark - colored objects ahead on which they can focus too. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching the snow -blanketed landscape. By focusing their attention on one object at a time. the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a continuous white land is overcome.

To prevent snowblindness caused by the strong light from snow, wearing glasses or not ________.

　　A. depends on whether the snow is white enough

　　B. makes no difference

　　C. makes much difference

　　D. depends on whether the snow is thick

When the eyes are tired, tears flow out ________.

　　A. to clear the vision

　　B. to make the eyes stop searching

　　C. to make the vision unclear

　　D. to produce more and more liquid

Snowblindness can be avoided ________.

　　A. by moving one’s gaze back and forth

　　B. by walking ahead and keeping looking around

　　C. by making up for the discomfort of one’s eyes

　　D. by providing the eyes with something to focus on

阅读理解

阅读下列短文，从每题所给的四个选项中选出最佳选项。

　　There are 25,000 kinds of bees identified in the world. The most well-known are the honey bee. In the United States there are known 3,500 species. Most bees do not live in large groups, they are solitary(独居的)bees. The honey bee is not a native of the United States. The first bees were brought to the U.S. from Holland. Later other bees were brought from many other countries. South America had some honey bees, but they did not produce much honey.

　　When honey bees were brought to the United States, native American called them“white man's flies”. Soon bees became a known sight in America.

　　In Brazil, honey bees did not survive well and scientists brought African bees to Brazil. These bees were found to be aggressive(好斗的) and mistakenly escaped into the wild. These bees are very common in Brazil now.

　　Beekeepers raise bees for honey, but more often they raise them to pollinate crops. Pollination occurs when the bee lands on a flower and some of the pollen(花粉)gets stuck to the bees' hairy legs. The next time the bee lands, some of the pollen falls off her legs and onto another flower, allowing it to reproduce.

　　Beekeepers have been raising bees for their honey for thousands of years. The first beekeepers kept their bees in hollow logs or clay pots. Now they keep the bees in wooden hives. When beekeepers raise bees for honey, they must remove part of the hive to retrieve (获取) the honey. They must“calm”the bees by using a special smoker. The smoke is puffed out around the bees and the bees move slower and are not as aggressive.

1．What's the best title for the passage?

[　　]

A．An Introduction to Bees.　　　　　　B．Why Bees Are Kept.

C．The Great Use of Bees.　　　　　　D．Bees in the USA.

2．What's the meaning of the underlined word“pollinate”?

[　　]

A．Make something fertile (结果实的) with pollen.

B．Get pollen away from.

C．Plant.

D．Harm.

3．From the passage we can infer that _____.

[　　]

A．bees want their honey to he taken away in order to get more room

B．all bees are kept by raisers

C．bees don't want their honey to be taken away

D．it is easy to retrieve the honey

Mrs. White was a wealthy lady. She lived 　36　 in a large comfortable house where her children and grandchildren came to visit her frequently. However, she was　37　. She spent a lot of time thinking about her  38  and about her dead husband. Her children   39 about her and asked Dr. Green to see her.

Mrs. Green was an experienced doctor. She knew old people became upset in their ways and didn’t like to   40  what to do. She decided to get to know Mrs. White before she said anything. During the visit, Dr. Green asked Mrs White to give her a   41  of the house. Mrs. White was  42   her house and happily agreed. As they walked from room to room, Dr. Green   43  that there were a lot of violets (紫罗兰) in every window. She asked, “__44 _ do you have so many violets?” Mrs White replied, “ I love these   45  and they  46  so fast that I have more and more. When the tour of the house was over, Dr. Green said, “I have one suggestion to make. Whenever you   47 a friend or a neighbor that is   48 in bed or getting married, give 49  one of your violets.”

Mrs White said   50   about the doctor’s advice and for a few months    51 her visit, she didn’t give away any of her violets. Then one day she was invited to the   52  of her neighbor's daughter. She put a ribbon(丝带) on one of her potted plants and took it to the party. Later one of her friends was sick so she took a violet plant and took it to the hospital.  53    she began to give more and more of her potted violets to her neighbors. Over the years she  54 so many that she became known as the “  55  lady”.

1.                A．well           B．alone          C．quietly   D．happily

2.                A．cheerful        B．delighted       C．unhappy  D．disappointed

3.                A．money         B．children        C．big house D．old age

4.                A．talked          B．thought         C．worried  D．learned

5.                A．be told         B．be ordered      C．be wanted D．be invited

6.                A．tour           B．view           C．sight D．picture

7.                A．proud of        B．familiar with     C．interested in   D．anxious about

8.                A．looked         B．showed         C．noticed   D．watched

9.                A．How           B．Why           C．When    D．Where

10.               A．rooms         B．windows        C．children   D．flowers

11.A grow       B. make             C. become          D. produce

12.               A．ask            B．get            C．hear  D．want

13.               A．ill             B．sad            C．excited    D．pleased

14.               A．it             B．me            C．you  D．them

15.               A．nothing        B．anything        C．something D．everything

16.               A．before         B．after           C．during D．until

17.               A．lecture         B．graduation      C．celebration D．wedding

18.               A．Usually         B．Continuously    C．Gradually  D．Regularly

19.               A．sold out        B．gave away       C．grew D．kept on

20.               A．old            B．violet          C．rich  D．famous

Back in my country, when I was a child, I used to go to “market day” with my mother. One day each week, farmers used to ___1___ their fruit and vegetables into the city. They ___2___ one street to all cars, and the farmers set up tables for their ___3___. This outdoor market was a great place to ___4___. Everything was fresher than produce in grocery stores because the farmers brought it in ___5___ after the harvest. My mother and I always got there early in the morning to get the ___6___ produce.

The outdoor market was a wonderful adventure for a small child, ___7___ was like a festival — full of colors and ___8___. There are red tomatoes, yellow lemons, green lettuce, peppers, grapes, onions. The farmers did their own ___9___. They all shouted loudly for ___10___ to buy their produce. “Come and buy my beautiful oranges! They’re juicy and delicious and full of vitamins to ___11___ your children healthy and strong!”

Everyone used to ___12___ with the farmers over the ___13___ of their produce. It was like a wonderful drama in a theatre; the buyers and sellers were the “___14___” in this drama. My mother was an ___15___ at this. First, she picked the freshest, most attractive tomatoes, for example. Then she asked the price. The seller told her.

“What?” she said. She looked very surprised. “ So ___16___?”

The seller looked terribly ___17___. “My dear lady!” he replied. “I’m a poor, ___18___ farmer. These are the cheapest tomatoes on the market!”

They always argued for several minutes before agreeing ___19___ a price. My mother took her tomatoes and left. Both buyer and seller were ___20___. The drama was over.

1. A. carry            B. take　        C. bring             D. fetch

2. A. opened　         B. closed　　     C. started　　             D. stopped

3. A. produce　       B. goods　　     C. food　　         D. product

4. A. buy           B. sell　　    C. bargain　　         D. shop

5. A. hurriedly       B. immediately    C. directly            D. straightly

6. A. best　　       B. finest　　     C. freshest            D. cheapest

7. A. who　          B. that　　　     C. which　　       D. what

8. A. voices          B. noises　　     C. sounds　　              D. accent

9. A. shopping       B. business　     C. shouting　        D. advertising

10. A. customers      B. producers　   C. themselves        D. sellers

11. A. keep              B. let　　      C. expect              D. make

12. A. argue          B. talk　　　     C. discuss　　          D. speak

13. A. order          B. price　　　   C. quality　　         D. form

14. A. viewers       B. listeners　      C. actors             D. directors

15. A. actress　       B. inventor　      C. advancer　         D. expert

16. A. wonderful      B. exciting       C. cheap　　　         D. expensive

17. A. injured　        B. hurt　　      C. damaged　         D. wounded

18. A. excellent        B. fair　　　     C. honest　　           D. easy

19. A. with           B. to　　　           C. in　　　　               D. on

20. A. disappointed　B. encouraged  C. satisfied　　　      D. tired

. _______ different kinds of pianos, the workers farther improved their quality.