_________ water to grow is well-known.

 A. That trees need      B. These trees need

 C. That tree needs      D. Trees need

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（转基因的）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 （五角大楼） 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 （杨树与桉树）, apple and coffee trees are among those being engineered．All this can be done today because we have a better understanding of tree genomes （基因组）．
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

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（转基因的）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 （五角大楼） 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 （杨树与桉树）, apple and coffee trees are among those being engineered．All this can be done today because we have a better understanding of tree genomes （基因组）．

         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

When I was growing up, I had an old neighbor named Dr. Gibbs. He didn’t look like any doctor I’d ever known. He never yelled at us for playing in his yard. I remember him as someone who was a lot nicer than most of the adults in our community.

When Dr. Gibbs wasn’t saving lives, he was planting trees. His house sat on ten acres, and his life’s goal was to make it a forest.

The good doctor had some interesting theories concerning plant care and growth. He never watered his new trees, which flew in the face of conventional wisdom. Once I asked why. He said that watering plants spoiled them so that each successive tree generation would grow weaker and weaker. So you have to make things rough for them and weed out(淘汰) the weaker trees early on. He talked about how watering trees made for shallow roots, and how trees that weren’t watered had to grow deep roots in search of moisture. I took him to mean that deep roots were to be treasured.

So he never watered his trees. He planted an oak and, instead of watering it every morning, he beat it with a rolled-up newspaper. Smack! Slap! Pow! I asked him why he did that, and he said it was to get the tree’s attention.

Dr. Gibbs passed away a couple of years after I left home. Every now and again, I walked by his house and looked at the trees that I’d watched him plant some twenty-five years ago. They’re extremely tall, big and robust since they have deep roots now. However, the trees in my garden trembled in a cold wind although I had watered them for several years.

It seems that adversity(逆境) and suffering benefit these trees in ways comfort and ease never could. I stood there deep in thought.

Every night before I go to bed, I check on my two sons. I stand over them and watch their little bodies, the rising and falling of life within. I often pray for them. Mostly I pray that their lives will be easy. But I think that it’s time to change my prayer(祷词) because now I know my children are going to encounter hardship.

1.According to Dr. Gibbs’ theories, trees will become weaker if they _________.

A. are lack of care　　　　　B. are watered      C. are weeded out　　　　　D. are beaten

2.According to Para.3 and Para.4, we can infer that Dr. Gibbs’ motto(座右铭) may be       .

A. “Seeing is believing”                                    B. “Put everything in proper use”

C. “Practice makes perfect”                               D. “No pain, no gain”

3.The underlined word robust in Para.5 most probably means _________.

A. strong　　                      B. strange　　       C. deep　　                        D. old

4.Which of the following may be the author’s best prayer for his two sons now?

A. I wish them strong wings, with which they can fly higher and touch the sky.

B. I wish them nice fortune so that they can meet people like Dr. Gibbs in the future.

C. I wish them deep roots into the earth since the rains fall and the winds blow often.

D. I wish them great shades under the tree since the sunlight is always sharp and bitter.

5.Which of the following can be the best title of this passage?

A.     A Nice Doctor  B. The Deep Roots  C. Adversity and Suffering  D. My Childhood Memory

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（转基因的）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 （五角大楼） 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 （杨树与桉树）, apple and coffee trees are among those being engineered．All this can be done today because we have a better understanding of tree genomes （基因组）．

????????????? 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．

1.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．

2.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．

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

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

4.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