四、读写结合(共两节,满分25分)
第一节 任务型阅读(共5小题,每小题2分,满分10分)
阅读短文,用英文填空或回答问题。(注意每小题的词数要求)
Welcome to the Amazon rainforest. As the largest
rainforest in the world, it plays an important role in keeping
the balance of nature(保持生态平衡) on the earth. With an
area of around 5.6 million square kilometers, the Amazon
rainforest is more than half the size of China. This area has a
great many species(物种). Actually, one in ten known
species in the world can be found here.
Of the 390,000 plant species known to us, more than
40,000 can be found in the Amazon. There are different
levels in the forest. At the bottom is a system of roots under
the ground. Above that is leaf litter on the dark forest floor.
The next level is made up of shorter plants with large leaves.
Then there are the towering ancient hardwoods, and finally
the tops of the trees which are taller than any other level of
trees in the forest. Each level of the forest forms its own
little world, home to different kinds of living things.
More than 1,300 species of birds and over 400 species of
mammals(哺乳动物) hide among the forest's plant life. This
jaguar is one example. While a large number of jaguars
survive here, they are only one part of this forest's food chain
(食物链). They feed on at least 87 species, including frogs.
These frogs, in turn, feed on insects which eat leaves and
fruits.
The Amazon rainforest is a treasure house of species that
can be used for food or medicine. What's more, the Amazon
rainforest breathes life into the planet by producing 6% -
10% of all the Earth's oxygen($O_{2}$). So it is often known as
the "lungs of the planet".
46&47. Fill in the blanks according to the passage.

48. According to the passage, there are a large number of jaguars living in the rainforest and they feed on .(不超过5词)
49. Known as the "lungs of the planet", the Amazon rainforest produces 6—10% of .(不超过5词)
50. What do you think of the Amazon rainforest? Why?
(不超过20词)

46. tallest
47. insects
48. at least 87 species
49. Earth's oxygen
50. It's vital. It balances nature and produces oxygen.

46. 根据短文第二段“finally the tops of the trees which are taller than any other level of trees in the forest”，可知此处指森林里最高的树，故填tallest。
47. 根据短文第三段“These frogs, in turn, feed on insects which eat leaves and fruits.”，可知食物链中树叶和果实的下一级是昆虫，故填insects。
48. 从短文第三段“They feed on at least 87 species, including frogs.”可知，美洲豹以至少87种物种为食，符合词数要求。
49. 由短文最后一段“producing 6% -10% of all the Earth's oxygen”可知，亚马逊雨林产生地球6%-10%的氧气，故填Earth's oxygen。
50. 结合文章内容，亚马逊雨林对地球生态至关重要，它维持生态平衡并产生氧气，组织符合词数的语句即可。