1 . 阅读下面短文，根据短文内容，完成下列各题。

In many countries, people are encouraged to buy electric cars. It is said that driving an electric car is good for the environment. But is that true? The University of Minnesota recently studied emissions (排放物) from different cars. The scientists found that sometimes, electric cars are more harmful than petrol (汽油) cars.

Surprising? Well, please pay attention to the word “sometimes”. Electric cars are supposed to be clean. The problem lies in the power that is used to charge them. If the power comes from wind or solar energy, electric cars will cause little pollution. However, if the power is produced from coal, they will be very harmful. According to the study, emissions from these cars kill about 3,000 people a year. However, pollution caused by petrol cars only leads to 880 deaths a year.

In fact, sales people are not lying when they say electric cars are clean. However, they are right only when the power used to charge their cars is also clean.

So how clean electric cars are depends on what its electricity comes from. In France, more than half of the power comes from nuclear (核) stations. Electric cars there should be as clean as they are marketed to be. In many developing countries, however, electricity mainly comes from coal. India, for example, depends on coal for 61 percent of its power. Only two percent of electricity comes from nuclear energy. In countries like India electric cars are not clean at all.

1. Why are people in many countries encouraged to buy electric cars? Because they think electric cars ______________________________________ the environment .
2. How are electric cars whose power come from wind or solar energy?
If the power of electric cars comes from wind or solar energy, it will cause ______________________________________.
3. How many people may be killed a year by the emissions from the cars whose power is produced by coal?
Emissions from the cars whose power is produced by coal can kill about ______________________________________ people a year.
4. According to the passage, in which country the electric cars are cleaner than many developing countries?
Electric cars from ______________________________________ are cleaner.
5. Where may power of electric cars come from? (至少写出文中提到的两种能源)
______________________________________.

3 . Camels(骆驼) are amazing animals. They aren’t the most beautiful animals in the world. But they are certainly the most useful animals in the hot areas such as North Africa and the Middle East. They usually help people carry things. Now let’s learn more about camels.

There are two kinds of camels on the Earth. They are Arabian(阿拉伯的) camels and Asian camels. Arabian camels are dromedaries(单峰骆驼), but Asian camels are bactrians(双峰骆驼).

An adult camel is about 2 meters tall and about 500 kilograms in weight. Its legs are long. And its feet are big and soft. Most of the camels can live for about 40 years, but they usually stop working when they are about 25.

Camels live alone in the desert(沙漠). They aren’t afraid of the hot and cold weather. Their main food is grass, leaves and bushes. They can walk for more than 600 kilometers and don’t need to drink water. They only need to drink water every six or eight days. But when there is water, they can drink up to 90 liters(升). Camels walk slowly. They don’t like running because it’s too hot. But if they need, they can run at 20 kilometers an hour.

根据短文内容，用短文中符合语义及语法规则的词填空，每空一词。
1. There are two kinds of camels on the Earth. They are ________ camels and ________ camels.
2. Camels live ________ in the desert areas ________ ________ North Africa and the Middle East.
3. ________ camel can live for about 40 years, but they usually don’t ________ any more at 25.
4. They mainly live on ________, ________ and bushes.
5. They only need to drink water every six or ________ days.