Plants and animals, including humans, need food and water to live on. These are from the natural resources
(资源) on Earth. To protect these resources, we need to keep the air clean and the water drinkable. We need
to keep the soil healthy. How do we do that?
* Protect the land
    The soil that covers fields and farms provides much of the food we eat. Human activities such as plowing (耕) fields, mining (采矿), and building highways can destroy (破坏) the land. Erosion happen when wind and
water carry away the soil. Soil erosion can turn rich farmland into a desert wasteland. So does this mean we
shouldn't build a highway or plow a field? Of course not. But it does mean we might think about Earth-friendly
ways of doing those things.
    Today farmers plow their fields in different ways to prevent erosion. They try to use less water for their
crops. They keep animals from eating the growing grass in just one area. Farmers also plant trees to prevent
erosion from happening.
* Save the Trees
    Another human activity that damages the land is deforestation (采伐森林). People take away a large number
of trees from a forest. Millions of square kilometers of forest disappear each year. When this happens, many
plants and animals lose their places to live. They may die out, or become very few. Scientists haven't even
discovered all the living things in the forest. We may be losing some without even knowing they are there.
Trees absorb (吸收) and use carbon dioxide (二氧化碳) when they make food. Environmentalists encourage
careful management of the forests. They ask people to replant trees after they cut down the forest. 
* Recycle, Reuse, Reduce
     People throw a piece of paper into the wastebasket after using it. The paper becomes trash. Where does
the trash go next? Much of our trash ends up in landfills (垃圾填埋地). They take up valuable land and
sometimes pollute the water, air, and land around them. More than a third of the trash in landfills is paper.
Recycling, reusing, and reducing what you throw away can cut down on the need for more landfills. In fact,
we can recycle about eighty percent of household trash.

1. What does the underlined word "erosion" mean?

A. Plowing fields and mining.
B. Cutting down trees and farming.
C. Wind and rain carrying away soil.
D. Building highways on the farmland.

2. How do farmers prevent erosion now?

A. They try to use more water for their crops.
B. They stop animals from eating the growing grass in just one area.
C. Farmers also plant flowers to prevent erosion from happening.
D. They move to another place.

3. Why do we need to save the trees?

A. To discover more new trees every year.
B. To make more money.
C. To take away a large number of trees from the forest.
D. To keep good places for animals and plants to live in.

4. How much of the trash can we recycle?

A. All the trash.
B. Very little.
C. One third.
D. Four fifths.

5. What's the purpose of the author writing the passage?

A. To ask people to look for places to plant trees.
B. To tell people how to protect natural resources.
C. To show how the lands are destroyed by people.
D. To discuss ways of protecting animals and plants.

     Is an earthquake (地震) dangerous? Yes, of course.  But this doesn't mean you can't do anything
about it. If you know what to do in an earthquake, you can be safe.
     Keep a cool head. Worry rnay cause (导致) bad decisions. Don't follow others blindly (盲目地).
Think about what you should do.  The first several minutes are important.
     If you are indoors cluring an earthquakc, quickly move to a safe place in the room such as under a
desk or table. Take care of your head. Stay away from windows and things that may fall and hurt you.
     If you are in a crowded room and far away from the door, don't rush to it.  You will find too many
people trying to escape (逃跑) at the same time. Instead (相反), stay under a desk or table. Don't use
an elevator (电梯). You may not get out of it.
     Stay in a safe place until you are sure it's ()K to leave. Some aftershocks (余震) may follow an
earthquake. These are as darigerous as the earthquake.
     If you are in dcbris (废墟), try to  free your hands and legs. You may make noises by hitting stoncs.
Shouting (喊叫) will make you tired. Try to find some water and food. They are important for you if you
aren't found in a short time. Wait patiently  (耐心地) for help.
根据短文内容，判断下列句子正误，正确的写（T），错误的写（F）。
(     )1.  Don't stay near the windows if you are indoors during an earthquake.
(     )2.  You may not get out if you use an elevator during an earthquake.
(     )3.  Rush to the door together if you are in a crowded room in an earthquake.
(     )4.  Keep staying in a safc place until you are sure it's OK to leave after an earthquake.
(     )5.  You should keep shouting until others hear you if you are in debris.