Global warming is the process of earth’s atmosphere heating up. Over the last 10

Global warming is the process of earth’satmosphere heating up. Over the last 100 years, the average temperature ofearth’s atmosphere has gone up 1 Fahrenheit. The weather has not changedexactly the same way in every area of the planet. But scientists think that therise in average temperature is already affecting the earth’s climate.

Many scientists now believe that globalwarming is caused by cutting down trees, producing more trash, and pollutingthe environment are some of the reasons that the temperature has gone up. Manyscientists believe that the biggest causes of global warming are new humantechnologies that release greenhouse gases into the atmosphere.

The greenhouse effect is not new. Certaingases in the atmosphere, like carbon dioxide, nitrous oxide and methane,prevent heat energy from escaping back into space. In the past, the climatedidn’t change much because nature produced just the right amount of greenhousegases to deal with it.

Today, most scientists are pretty sure thatthe rising temperature can’t be blamed on nature. Ever since the industrialrevolution in the 1700s, humans have relied on machines for daily life. Andmany of those machines give off a lot of greenhouse gases. An increase in therelease of greenhouse gases from human activities is throwing nature offbalance.

The climate is a very complicated thing, butmany scientists agree that the rising atmospheric temperature has alreadydamaged the environment. Sheets of ice, called glaciers, are melting in Antarctica and other parts of the globe. As glaciers break off and melt into the oceans,they are adding warm water to the oceans and causing the sea level to rise.

Over the past last 100years, the sea levelhas risen 6-8 inches around the world. That means land along the coasts isbeginning to disappear under water. Bigger and warmer oceans are also adding toother weather problems caused by pollution in the atmosphere. Some places havereceived more rain, others have had bigger storms and a few areas in the worldhave experienced unusual droughts.

1.Whatis mainly talked about in this passage?

  A. The melting ofglaciers.               B. Global warming.

  C. The world’sweather.                 D. The earth’s temperature.

2.Whatcauses global warming according to scientists?

  A. Humanactivities.                    B. The nature itself.

  C. The earth’satmosphere.               D. New discoveries

3.Howcan greenhouse gases make the globe warm?

  A. They keep heat in the atmosphere   

B. They let the heat go out into space.

  C. They release heat into the air.       

D. They can make the other gases warm.

4.Fromthe passage we can see that global warming will bring about _________.

  A. the pollution in theatmosphere            B.natural disasters

  C. populationpollution                    D. the rise of glaciers

试题答案

【答案】

1.B

2.A

3.A

4.B