"On no account ____to feed the animals", the warning can be seen on the signboard in front of every cage.

On the night of May, 7,1942, a plane took off from an Air Force base in England to stop German fighters over the English Channel. The pilot of the plane was Captain Thomas Nash. Looking eastward, Nash saw twelve orange lights in a row, moving at an extremely high speed. As an experienced flyer, he had never seen anything like them. Thinking that they might be a new German weapon, he decided to follow them. But when he swung the plane around and headed directly for the lights, they disappeared.
Captain Nash may have been the first to see such orange lights but he wasn’t the last. His experience was repeated several times by pilots during World War Ⅱ in Europe and the Far East. What were they? No one knows for sure, but there is an interesting theory to explain them. According to this theory, the orange lights are space animals – animals specially adapted to life in the upper atmosphere just as some creatures are adapted to life at the bottom of the sea. These space animals, the theory says, live so far up in the atmosphere that they are invisible from the earth. They feed in part on the air and partly on energy from sunlight. Being almost pure energy themselves, they can give light at night. During the day they become invisible.
Before World WarⅡ, continues the theory, there was little radiated (輻射) energy available on the earth’s surface. Then came the development of rockets, atomic reactor (核反應(yīng)堆), and hydroelectric (水力發(fā)電的) plants. The space creatures are attracted by these sources of energy. At night when no energy is sent from sunlight, they go down into the lower levels to search a meal. They may even come into the scope of human eyesight. This explains the fact that they have been sighted now and then from the earth since 1942.
54．Which of the following best states the main idea of the passage?
A．The secret of nature can be completely explained.
B．Captain Nash may have been the first to see the lights in space.
C．Captain Nash saw twelve orange lights moving at a high speed.
D．According to an interesting theory, the orange lights are space animals.
55．The strange orange lights were first seen         .
A．from the ground                                  B．from a rocket ship
C．during World War I                             D．during World WarⅡ
56．The theory says that during the daytime the space animals        .
A．can’t be seen                                       B．shine brightly in the sky
C．can be seen from the earth                    D．visit the earth’s surface
57．If the space theory is true, the creatures go down to the lower places in order to         .
A．make connection with man                   B．search for man – made energy
C．a(chǎn)ttract curiosity                                   D．escape detection

On a cold winter day, two men walked along a valley. Finally, they stopped at a grave（墳?zāi)梗? which was covered with thick  1  . The gravestone looked very  2  . The older man said to the young man,“This is your mother’s grave…”The young man  3  in the snow.

This   4 took place 20 years ago. At that time the most intense 5  had occurred here. Among the soldiers was Wilson. The strong  6  had made the forces retreat（撤退）. Wilson had headed forward in the snow with the troops in front of him. 7  , he heard a baby’s cry, which came from a hole in the snow. Wilson dug into the snow, and was immediately  8  by what he had seen.

In a mother’s arms, the baby was crying aloud. What was even more shocking was that the mother was naked. It turned out that they were  9   in this valley by the heavy snow. In order to  10  her baby, the mother had wrapped all her 11   around the child while holding him tightly in her arms. Though the mother had been 12  , the baby in her arms had survived. Wilson was deeply moved by such an unexpected  13  . He buried the mother and held the   14   baby to pursue（追趕）the   15  .

After the war, he took this child to the United States to   16  . When the child grew up, Wilson told him what   17   that year and took him to the valley to   18   his mother.

Kneeling at the grave, the young man burst into tears. After a while, the young man started to clean the snow on the grave. After cleaning the snow around, he undressed himself, 19    the grave, threw himself on the grave and spoke out the words from his heart,“Mom, how   20   you were for so many years!”

1.A. leaves             B. snow                   C. dust           D. grass

2.A. simple            B. clean                      C. beautiful             D. big

3.A. gave up          B. stood up                C. knelt down   D. broke down

4.A. party     B. strike                  C. accident            D. story

5.A. speech           B. whisper                C. fighting     D. argument

6.A. competition        B. enemy                C. disease     D. storm

7.A. Fortunately         B. Frequently                     C. Immediately  D. Suddenly

8.A. shocked         B. puzzled                 C. frightened              D. annoyed

9.A. wounded       B. trapped                C. killed         D. frozen

10.A. feed             B. teach                  C. save                 D. hide

11.A. clothes         B. blankets               C. packages           D. handkerchiefs

12.A. sick          B. dead              C. hungry       D. lost

13.A. mark             B. condition              C. voice         D. scene

14.A. growing   B. crying          C. running      D. singing

15.A. troops          B. mother                   C. path            D. goal

16.A. show him in      B. call him in                C. bring him up  D. pick him up

17.A. happened         B. appeared                C. started           D. formed

18.A. depend on       B. attend to                 C. care about          D. look for

19.A. moved         B. decorated                 C. covered     D. dug

20.A. tired             B. fearful          C. lonely             D. cold

 "On no account ____to feed the animals", the warning can be seen on the signboard in front of every cage.

A．a(chǎn)llow visitors                           B．visitors are allowed

C．a(chǎn)re visitors allowed                      D．a(chǎn)re allowed visitors

Feed the world

With the global population expected to rise to 9 billion within 50 years, feeding the world has never seemed such a daunting task. But GM(轉(zhuǎn)基因)technology is giving hope to developing countries, where many people think biotechnology can offer improved nutrition, health and prosperity(繁榮).

High hopes

Many scientists in Africa regard GM crops as the only way to avoid mass starvation (饑餓) on the continent. Kenyan researchers recently created a GM sweet potato that they predict could increase yields by up to 80 percent.

Meanwhile, South African scientists have used genetic modification to insert the vaccine (疫苗) for the disease cholera (霍亂) into bananas. Cholera is a particularly serious problem in South Africa. But there are still several barriers that stop developing countries from growing GM crops on a large scale.

Obstacle course

Private enterprise is unwilling to invest in GM products that would benefit developing countries. Regulatory clearance (許可證) to grow a single GM crop can cost companies between $5 (￡3.4 million) and $30 million (￡20.5 million), so they tend to focus on areas that give them large returns on their investment.

Use only once

In traditional farming, some seeds from a harvest are saved to be planted the following year. But biotech companies force farmers growing GM crops to buy new supplies of seed every harvest. Farmers in Canada have even been sued(控告)for re-planting GM seed.

But biotech companies think it will be harder to enforce this rule in developing countries, so they have been coming up with cunning(狡猾的)methods to make farmers come back for seed each year.

This approach could make farmers too dependent on such companies for their livelihoods, leading them to neglect the basic farming skills they would need to rely on if their situation changed and possibly bankrupted (破產(chǎn)) them.

Going it alone

Developing countries are making real progress in genetic engineering, and have already produced their own GM crops. But many environmentalists are worried that developing nations would not apply strict testing to GM crops and food safety regulations (規(guī)章).

5. From the first paragraph we know that ________.

A. food supply for the whole world is out of question because of GM technology

B. food supply for the whole world is still a serious problem because of the increasing of population

C. food supply for the whole world is never a problem because of biote chnology

D. people in developing countries will never have food shortage because of GM technology

6. The purpose of growing GM crops is ________.

A. to provide safer food for the world

B. to find a new cure to the disease cholera

C. to get a lot of money by selling the seeds

D. to prevent the world from mass starvation

7. Some enterprises are unwilling to spend money on GM products because ________.

A. the products will benefit developing countries

B. they have to pay a large amount of money to get the permit

C. they don't have much knowledge about the GM technology

D. they can't get enough seeds from the biotech companies

8. It can be inferred that________.

A. growing GM crops would possibly make farmers bankrupt

B. companies could grow GM crops freely once they had the GM technology

C. developing countries are growing GM crops on a large scale

D. scientists are not sure about whether GM crops are safe to eat