A few weeks ago a group of scientists produced a report about global warming and the natural world．They wanted to find out if global warming was dangerous for plants and animals．The scientists were surprised by what they found．They say that during the next 50 years about 25% of land animals and plants will become extinct(灭绝的)．More than 1 million plant and animal species will become extinct by 2050．

The head of the research team, Christ Thomas, who is professor of conservation biology at Leeds University, said the results of their research were frightening．More than 10% of all plants and animals will become extinct．It is too late to save many plants and animals because of the greenhouse gases that are already in the atmosphere．But the scientists say if we control greenhouse gases now, we could save many more plants and animals from extinction．

The scientists studied some areas of the world with a very rich biology．These areas were Europe, Australia, Central and South America, and South Africa．Their studies showed that species living in mountainous areas had a better chance of survival because they could move uphill to get cooler．In flat areas, such as deserts, plants and animals would have to move very long distances to get cooler, so they are in greater danger of extinction．The scientists found many surprising things．For example, they found that half of the 24 species(物种) of butterfly they studied in Australia would soon become extinct．

64．According to this passage, global warming could be best described as ________ to many plants and animals．

A．deadly                  B．surprising                C．disappointing         D．frightening

65．What’s the purpose of the research led by Christ Thomas?

A．To protect animals and plants from global warming．

       B．To call on people to control greenhouse gases．

       C．To warn us of the extinction of many animals and plants．

       D．To study the effects of global warming on animals and plants．

66．Why did species living in mountainous areas have a better chance of survival?

A．Mountains helped keep them out of more heating．

       B．Global warming had no effect on mountainous areas．

       C．There were no greenhouse gases in mountainous areas．

       D．There were more water in mountains than in deserts．

67．Which of the following is NOT true?

       A．It is certain that many plants and animals will die out．

B．Half of the Australian butterflies would die out．

C．Many more animals and plants still can be saved．

D．Europe is one area which has a very rich biology．

68．What can be the best title of this passage？

A．Greenhouse effect and global warming

B．Extinct animals in the world

C．A terrifying discovery concerning global warming

D．Disappearance of butterflies

根据文章，从下框A-F选项中选出能概括每一段主题的最佳选项，选择中有一项为多余。

根据文章，从下框A-F选项中选出能概括每一段主题的最佳选项，选择中有一项为多余。

61.

    The earth is getting warmer. People burn coal, oil and gas and this produces carbon dioxide, methane（沼气）and nitrous oxide. These gases, called “greenhouse gases”, prevent the heat of the sun from leaving the earth’s upper atmosphere and this makes the earth warmer

62.

    A few weeks ago a group of scientists produced a report about global warming and the natural world. They wanted to find out if global warming was dangerous for plants and animals. According to what they found, the scientists say that during the next 50 years about 25% of land animals and plants will become extinct. More than a million plant and animal species will be extinct by 2050.

63.

    More than 10% of all plants and animals will become extinct. It is too late to save many plants and animals because of the greenhouse gases that are already in the atmosphere. But the scientists say if we control greenhouse gases now, we could save many more plant and animals from extinction.

64.

The scientists studied some regions of the world with a very rich biology. These were Europe, Australia, Central and South America, and South Africa. Their studies showed that species living in mountainous areas had a better chance of survival because they could move uphill, to get cooler. In flat areas, such as deserts, plants and animals would have to move a very long distance to get cooler, so they are in grater danger of extinction.

65.

The scientists found that half of the 24 species of butterflies they studied in Australia would soon become extinct. 60% of the species in the Kruger National Park in South Africa would also die out, and more than 100% of the 300 South Africa plant species they studied would also become extinct. One of the plants in danger of extinction is the national flower of South Africa, the King Protea. They studied 163 tree species in the Cerrado region of Brazil and found that 70 would become extinct. Many of the plants and trees that live in the region live nowhere else in the world. In Mexico, they studied 1,870 species and found that more than 30% of these were in danger of extinction.