2 . 根据课文内容填空

As that heat rises, some of it is     1     by gases in the atmosphere and reflected back towards the planet’s     2    . Like the glass in a greenhouse     3     holds heat inside the building, gases in the air hold in heat around Earth. Scientists call this global heat-trapping     4     the greenhouse effect. The greenhouse effect keeps the temperature of our planet’s surface comfortably warm.

Several gases in the atmosphere     5     to global warming. The one you’ve     6     heard the most about is carbon dioxide. Carbon dioxide is a good heat-trapping gas—a greenhouse gas,     7     scientists say.     8     certain amount of carbon dioxide in the atmosphere is     9    . In fact, you add some     10     the air every time you breathe out.

3 . 课本原文填空。

The most     1     earthquake in the past 40 years caused a tsunami that     2    into coastlines across Asia yesterday，killing more than 6,500 people in Indonesia, India, Thailand, Malaysia, and at least four other countries. Fishermen, tourists, hotels, homes, and cars were     3     away by huge     4     caused by the strong earthquake that reached a magnitude of 9.0. The undersea quake     5     around 7:00 a.m., Sunday off the coast of Indonesia’s Sumatra Island. In that area alone, at least, 1,870 people were killed.

4 . 根据文章内容及所给单词的首字母，写出文中所缺单词，使文章完整、通顺。

The Great Wall twists and turns a    1     the tops of mountain chains in n    2     China. It is m    3     than 4,000 kilometers l    4    . Building the wall took a long time. It began in the fifth century BC, and the wall finally took shape in the third century BC. From Beijing, you can visit the great wall at Badaling, kilometers north-west of the city.

The Great Wall at Badaling o    5     at 6:30 a.m. and closes at 5 p.m. in the summer. The scenery along the Li River in Guiling is just l    6     a beautiful p    7    . Take a boat t    8    , and you will be a    9     by the peaks along the r    10     and their reflections in the clear w    11    . Walking and cycling in Guiling is also great f    12    . Along the paths near the river you can see local village l    13    , and you can t    14     a mud bath in the n    15     caves.

6 . 阅读下面短文，在空白处填入几个适当的单词。

The experts were now fully convinced that the animal was a puma， but where had it come from? As no puma had been reported missing from ant zoo in the country, this one must have been in the possession of a private collector and somehow     1     The hunt went on for several weeks, but the puma was not caught. It is disturbing to think that a dangerous wild animal is still     2     in the quiet countryside.

7 . 课文填空

To their credit the four countries     1     work together in some areas（eg, the currency and international relations）, but they will have very different institutions.

England is the largest of the four countries, and for,     2     it is divided roughly into three zones. . . You find most of the population     3     in the south, but most of the industrial cities in the Midlands and the North of England. Although, nationwide, these cities are not as large as     4     as China, they have world-famous football teams and some of them even have two!

8 . For several billion years after the “Big Bang”, the earth was still just a     1    of dust. What it was to become was     2     until between 4.5 and 3.87 billion years ago when the dust    3    into a solid globe. The earth became so violent that it was not clear    4    the shape would last or not. （根据课文内容填空）

9 . 课本原文填空。

She spent years     1     and recording their daily activities. … Only after her mother came to help her for the first few months     2     she allowed to begin her project. … She is leading a busy life but she says: “Once I stop, it all comes     3     in and I remember the chimps in laboratories.…”