Question

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 (楊樹與桉樹), 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.

What trees are 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. Trees that can improve soil conditions.

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.

The best title of the passage is         .

A. The improvement of environment

B. The side-effects of special trees

C. The development of special trees

D. the program of genetically engineered trees

Answer 1

【小題1】C

【小題2】B

【小題3】A

【小題4】D

解析:

【小題1】綜合判斷題。 “防蟲”“抗化學物的污染”都是轉(zhuǎn)基因樹的特征，在文章中都有提及。而C項沒有提到。

【小題2】 細節(jié)理解題。 從第二段“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”可知。

【小題3】 細節(jié)理解題。從第二段“When 40 per cent of Hawaii's US$14 million-a-year papaya (木瓜)industry was destroyed by a virus five years ago，…” 此句可以推測出。

【小題4】 主旨歸納題。縱觀全文，可知本文主要講轉(zhuǎn)基因型樹的開發(fā)。