题目内容：

Nowadays it’s believed that the largest contributors to air pollution are gasoline vehicles. They not only give off harmful gases but also dangerous and heavy metal particles（微粒） that can result in environmental dangers. We can’t stop using vehicles and thus stop air pollution right away. However, at least we can look for better replacements so that air pollution can be reduced. According to studies, hydrogen （氢）cars prove to be a better replacement for traditional cars.

A hydrogen car is a vehicle that uses hydrogen as fuel for its engine to work. There are two types of hydrogen cars. The first one is to use hydrogen as a fuel, and the second one is to use hydrogen fuel cells（电池） to provide power for the car. Hydrogen and oxygen react chemically with each other to produce electricity, thus starting the car.

There are many advantages of hydrogen cars. For example, hydrogen is available in plenty. Therefore, you needn’t worry about a lack of hydrogen. More importantly, no harmful gases are released as by-products .The only by-products are water and a little amount of heat so air pollution is prevented up to a large extent.

However, there are also some problems with hydrogen cars. For instance, in case of damage, the cost of repairing and replacing fuel cells is high. Worse still, hydrogen is a material which can burn easily, so it can result in a huge explosion of the car.

The concept of hydrogen cars is relatively new for most people. Research is still in progress to reduce disadvantages and increase advantages. Therefore, hydrogen cars are expected to contribute their bit towards making this planet better and healthier!

1.The main purpose of the passage is to tell readers_____________.

A. a new type of cars.    B. to stop air pollution right away.

C. the weaknesses and strengths of hydrogen cars.    D. the reasons for air pollution.

2.Which isn’t the by-product made by gasoline cars?

A. Carbon monoxide.    B. Hydrogen.

C. Heavy mental particles.    D. Harmful gases

3.The author may disagree___________

A. Hydrogen is easy to burn.    B. There is no chance that we quit using cars.

C. Hydrogen can be used as fuel for the engine of traditional cars.    D. Hydrogen cars produce water and a little amount heat as by-products, thus reducing air pollution.

4.What can be inferred from the last paragraph?

A. Hydrogen cars have been put into use.    B. Hydrogen cars have a long way to go.

C. The concept of hydrogen cars is relatively new for most people.    D. Hydrogen cars made contributions to making this planet better and healthier.