题目内容：

    Scientists blame greenhouse gases for being a major cause of climate change around the world. This is because greenhouse gases trap heat in the atmosphere and make the planet warmer.

Now, a team of researchers has announced a successful experiment that turned carbon dioxide into useful liquid fuel. The researchers created a device, called a reactor, which changes bon dioxide into a pure form of formic acid(甲酸). Formic acid is a substance (物质) found in ants and some other insects, as well as in many plants. It is used as an antibacterial material and in the processing of some kinds of clothing.

Haotian Wang led the research team. He said in a statement that the results of the experiment were important because formic acid is a major carrier of energy. So, the substance can provide a way to reuse carbon dioxide and prevent it from being released into the atmosphere. “It’s a fuel-cell fuel that can generate electricity and send out carbon dioxide which you can grab and recycle again,” Wang said.

“Other methods for turning carbon dioxide into formic acid require intense purification processes,” Wang said. Such methods are very costly and require a lot of energy. The Rice University team said it was able to reduce the number of steps in the traditional process to create a low-cost, energy-saving method.

The researchers reported the reactor device performed with a conversion rate (转化率) of 42 percent. This means that nearly half of the electrical energy can be stored in formic acid as liquid fuel. The team said the reactor was able to create formic acid continuously for 100 hours with little degradation (退化) of the device’s parts.

Wang said the reactor could easily be used to produce other high-value products, including alcohol-based fuels. The researchers noted that the technology could also be a big help in solving another major energy problem—how to store large amounts of power in small places.

1.What factor is the main cause of climate change?

A.Greenhouse gases. B.Chemistry waste.

C.Formic acid. D.Liquid fuel.

2.What do we know about formic acid?

A.It is a large amount of power. B.It can be found in ants.

C.It is high- value equipment. D.It is a substance in clothing.

3.What is Wang’s attitude towards his own research?

A.Doubtful. B.Aggressive.

C.Optimistic. D.Uncaring.

4.In what magazine can you read this text?

A.A travel magazine. B.A sports magazine.

C.A music magazine. D.A science magazine.