It was a very foggy(雾茫茫的) morning in London. The fog was so thick that it was not1to see more than a foot or so. Buses, cars and taxis were stopped along the roadside, unable to move because the drivers couldn't2. People were trying to walk to their destinations(目的地), but most were losing their3 in the fog.

Mr. Smith had a very important meeting at the House of Commons, but he was not familiar (熟悉的) with the area and no one could take4there in such heavy fog. So he was a little 5. He was trying to find his way in the fog. Soon, however, he realized that he was lost. 6he bumped(撞) into a stranger(陌生人). Mr. Smith said sorry to the stranger and then asked him whether he7help him find his way. The stranger said it was a piece of cake and 8to take Mr. Smith to the meeting place. Mr. Smith9him and they started to walk. The fog was getting thicker and thicker every minute, 10the stranger had no difficulty in finding the way. They went along one street, turned down another, 11a square and at last, after about half an hour, they 12the meeting place.

Mr. Smith couldn't13how the stranger found his way. "It is wonderful, "he said. "But14do you find the way in the thick fog?"

"It is no trouble at all15me, " said the stranger. "I am blind. "

Noise is a kind of pollution. Cars and machines produce too much noise. It makes people feel uncomfortable. Making a loud noise in public also a sort of pollution. It not only disturbs others also hurts people's hearing. It can even make people go deaf have high blood pressure.

As students, we should help solve this environmental problem. First, we shouldn't speak a loud voice in public. Second, we should find a suitable time and place to enjoy music. We can also plant more trees.

If everyone makes a contribution the environment, we'll succeed in improving it.

Light pollution is a problem in many cities around the world. You can see the glow(暗淡的光)of many cities in the night sky. This is sky glow. Some cities give off so much light that they can be seen from space!

Light can shine into people's homes and keep them awake at night. Too bright light can make drivers unable to see for a long time.

Too much light can make seeing stars harder. For example, people built an observatory(天文台) on Palomar Mountain in the 1990s because the area was dark. But over the years, the local people have built more and more buildings in southern California and the lights of the cities have caused sky glow in the night sky.

You can help stop light pollution and save energy by turning off lights when you aren't using them, using lower watt bulbs(较低瓦数的灯泡) if you don't need bright light.

A. Working under bright lights in the workplace all day long can make people ill. B. It comes from streetlights, building lights, lights on billboards (广告牌) and so on.

C. The Palomar Observatory is trying to work with the local government to keep the light down so they can continue their important work.

D. Too much light is not only a waste of energy, but also it can affect people.

E. Scientists and people who want to look at stars must go to an area with less lighting to get a better look.

—He likes dogs and tigers.