2 . 下面文章中有3处需要添加小标题。请从以下选项(A、B、C和D)中选出符合各段意思的小标题，选项中有一项是多余选项。

Ways to Help Your Community Stay Quiet

Noise pollution isn’t just annoying. It can also cause psychological problems. If you want to cut back on the noise polution in your life, taking some measures together with your community will help you and your family feel happier and healthier.

    1    

Use your car horn(喇叭)only when necessary, as a way to let someone know you are around the corner.

    2    

The terrible sound of a car’s engine is never welcome, so make sure you are not the one causing noise pollution in your community and spring to get your car repaired. Keeping your car in good, quiet working order will be appreciated by everyone who lives near you.

Keep your music down.

It might sound beautiful to you, but respect the fact that others might not feel the same way. Don’t just assume that your neighbours want to hear your favourite opera as much as you do.

    3    

Communities with more trees are quieter than those without them, since large, leafy trees can help absorb noise, so such a project is always worth your effort.

A. Don’t use your car horn unnecessarily.
B. Stay away from the noisy streets.
C.Keep your car in good working order.
D.Take part in a community tree-planting project.

3 . Landslides and earthquakes are even more dangerous now than in the past because around half of the world’s population now live-in cities. Many people in cities and towns in South America and Asia are at risk from landslides. In April 2017,the city of Mocoa in Colombia was hit by a landslide, leaving many dead and injured. A great number of people live at risk from earthquakes too. These have claimed more than 1.6 million lives in the last hundred years.

Most disaster experts believe that things could get a lot worse. Professor Hou Ming of Peking University studies volcanoes. He warns that the world has not seen the worst yet. The worst eruption in human history was probably Mt Tambora in 1815,in Indonesia. Dust from the volcano rolled across the Earth’s skies. There was no summer in Europe and America the following year. But evidence shows that 73,000 years ago there was a much greater eruption. “It reduced temperatures by maybe 6°C in some places, and the whole planet was sent into winter for years. And there are about two of these events every 100,000 years...”

Why is Mt Tambora mentioned in the text?

A．To demonstrate the world could get worse.

B．To show volcano eruptions have taken many lives.

C．To explain a natural disaster by showing an example.

D．To describe the worst volcano eruption in human history.

4 . Even if you live a green lifestyle at home，it's possible to ignore that travels may be harmful to the environment. Here are some steps you can take to reduce the harm that comes from traveling.

    1    If you can reach a destination by train，choose one. It's a great way to see a destination and has a less environmental impact than flying. Use local public transport and travel on foot or by bike to explore smaller areas.

    2     Where you choose to sleep at night plays a key role in being a green traveler. If you are going to the mountains or into the countryside，look for an eco–friendly place to stay. Even during city travel，you can find environmentally friendly hotels.

Make clear the environmental challenges. Every country has environmental challenges to deal with. For some，it is plastic bags，for others the amount of energy used on air conditioning or heating. Make sure you know them and act responsibly. Use water wisely，for example，when you are in dry countries.

    3     Don't forget your green habits just because you are on holiday. Keep clean and save energy just like at home. Bring a couple of containers to pack and try your best to avoid any one–off packaging.

A．Be as green as you are at home.

B．Find eco–friendly accommodation.

C．Eat locally grown foods as much as possible.

D．Choose a green means of transportation.