Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US.

When 40 per cent of Hawaii's US$14 million-a-year papaya (木瓜)industry was destroyed by a virus five years ago, work began on creating genetically engineered (轉(zhuǎn)基因的) trees.

Researchers successfully introduced seeds that were designed to resist the virus. Since then, more and more people have been testing genetically engineered trees.

Some researchers put special bacteria into trees to help them grow faster and produce better wood. Others are trying to create trees that can clean polluted soil.

Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper.

The Pentagon (五角大樓) even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack.

So far, the poplar, eucalyptus (楊樹(shù)與桉樹(shù)), apple and coffee trees are among those being engineered. All this can be done today because we have a better understanding of tree genomes (基因組).

However, some people fear that the genetically engineered trees will cause dangerous results. They are worried that the new trees will breed with natural species and change the balance of the forest environment.

"It could be destructive," said Jim Diamond, an environmentalist. "Trees are what is left of our natural environment and home to many endangered species."

But researchers insist that science could give nature a fighting chance against both natural and man-made dangers.

They hope to answer the critics by stopping the new trees from breeding, so their effect on the environment can be controlled.

Which kind of tree is not the ones that scientists are planting in the US?

A. Trees that worms can't hurt.

B. Trees that can protect themselves at a chemical attack.

C. Trees that can resist wind better.

D. Genetically engineered trees.

What caused the American scientists to work on special trees?

A. They think science could give nature a fighting chance against both natural and        man-made dangers.

B. Great numbers of trees have been lost due to attacks by viruses.

C. Researchers successfully introduced seeds designed to resist the virus.

D. Tree genomes are mapped out so scientists know how to improve trees.

Which of the following was probably the first kind of trees being engineered?

A. Papaya.                    B. Pine.                 C. Apple.                      D. Poplar.

Why did critics think engineered trees dangerous? Because _______.

A. these trees can destroy the balance of nature

B. everything except trees has been genetically engineered

C. trees are home to many endangered species

D. these trees may affect normal trees

【小題１】Ｃ

【小題２】Ｂ

【小題３】Ａ

【小題４】Ｄ


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Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US．
When 40 per cent of Hawaii's US$14 million-a-year papaya （木瓜）industry was destroyed by a virus five years ago, work began on creating genetically engineered（轉(zhuǎn)基因的）trees．
Researchers successfully introduced seeds that were designed to resist the virus．Since then, more and more people have been testing genetically engineered trees．Some researchers put special bacteria into trees to help them grow faster and produce better wood．Others are trying to create trees that can clean polluted soil．Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper．
The Pentagon （五角大樓） even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack．So far, the poplar, eucalyptus （楊樹(shù)與桉樹(shù)）, apple and coffee trees are among those being engineered．All this can be done today because we have a better understanding of tree genomes （基因組）．
However, some people fear that the genetically engineered trees will cause dangerous results．They are worried that the new trees will breed with natural species and change the balance of the forest environment．
“It could be destructive,” said Jim Diamond, an environmentalist. “Trees are what is left of our natural environment and home to many endangered species.”
But researchers insist that science could give nature a fighting chance against both natural and man-made dangers．They hope to answer the critics by stopping the new trees from breeding, so their effect on the environment can be controlled．
63．Which kind of tree is not the ones that scientists are planting in the US?
A．Trees that worms can't hurt．
B．Genetically engineered trees．
C．Trees that can resist wind better．
D．Trees that can protect themselves at a chemical attack．
64．What caused the American scientists to work on special trees?
A．Tree genomes are mapped out so scientists know how to improve trees．
B．Great numbers of trees have been lost due to attacks by viruses．
C．Researchers successfully introduced seeds designed to resist the virus．
D．They think science could give nature a fighting chance against both natural and man-made dangers．
65．Which of the following was probably the first kind of trees being engineered?
A．Papaya．                     B．Pine．                          C．Apple．                        D．Poplar．
66．Why did critics think engineered trees dangerous? Because ________．
A．these trees can destroy the balance of nature
B．everything except trees has been genetically engineered
C．trees are home to many endangered species
D．these trees may affect normal trees

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完形填空(共20小題；每小題1.5分,滿分30分)

閱讀下面短文,從短文后各題所給的四個(gè)選項(xiàng)(A、B、C和D)中,選出可以填入空白處的最佳選項(xiàng)。

Something happened today that made me realize how much love I have in my house and I am so thankful for it.

My husband used to work in a bank but during the crisis he  36 his job. The economy wasn’t good and he hadn’t many  37 to get another bank job. We were hoping and  38 that he would be offered a position.

He got a  39 and it brought us a feeling of  40 . We were able to  41 our mortgage（按揭貸款） and buy our groceries; but money was still very  42 , so he found another job  43 deliveries from Monday to Thursday.

He has been working so  44  that I wanted to make it an extra  45 Christmas this year. I wanted our house to be filled with  46 －I didn’t want anybody to be  47 this year. I finally got round to getting the Christmas tree out yesterday and I worked all day to make the house look  48 .

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He was apologizing for working so hard to feed us and keep a  53 over our heads! He was doing two jobs that made much less than his previous job and coming home exhausted. I had no  54 to tell him how much I LOVED him and how  55 I was of him and that he was such a great husband and father and provider for us.

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