Have you ever really looked at a tree? All trees are big plants. Like all plants,trees have roots. The roots hold trees in the ground. They keep trees from falling over. They bring water and food that trees need to live on.

    A tree has a fat stem.We call the tree’s fat stem“trunk”. Inside the trunk,a tree holds water and food.The water and food go up the trunk to the green leaves. The leaves use sunlight to make more food for the tree.

    Trees help us. They help clean the air. They give us food.Fruits,nuts and chocolate all come from trees. Paper,chairs,beds and houses also come from trees.Trees are also important for other living creatures (生物) . They provide a home for birds and other animals. Many animals eat part of trees. Be friends with trees!We need trees and trees need us!Often young trees need special care. They need water and protection (保护) .

1. What can roots do for trees?

   A. To get sunlight to make food.

   B. To hold trees in the ground.

   C. To bring water and food for trees.

   D. Both B and C.  

2. A tree’s stem can move up       to the leaves.

   A. food   B. water

   C. water and food   D. sunlight

3. Which part of trees can make food for trees?

   A. Roots. B. Stems.

   C. Trunks. D. Leaves.

4. The third paragraph (段落) mainly tells us that       .

   A. trees make food for people

   B. trees are important for everyone

   C. trees provide a home for animals

   D. trees help clean the air

5. Which of the following is WRONG?

   A. Big trees don^ need water or protection.

   B. Part of trees is some animals’ food.

   C. Trees can make food from sunlight.

   D. Trees are a kind of big plants.

1. (2015 上海中考) Martin was so busy       the old that he gave up his parttime job.

   A. helping   B. helped

   C. to help   D. help

11. 打羽毛球      

12. 此时      

2. Mom is making dinner. It       so nice!

   A. smells   B. tastes

   C. feels   D. sounds

3. Be quiet!The students       a physics test in the next room.

   A. had   B. have had

   C. were having   D. are having

    The earth is about 4 ,600 million years old. Human beings have lived on the earth for only 35,000 years,but during this period we have changed our planet a lot in many ways. 1 .

    All over the world,people have cut down millions of trees,so more and more kinds of animals and plants are disappearing. In big cities,cars and buses have polluted the air. Factories have also polluted the land and the water.

     2 . It is important to the earth. But now air pollution is destroying it and that has made a very big hole in the ozone layer (臭氧层) . 3 . This is very dangerous because it can cause cancer.

    Carbon dioxide ( C0₂) in the air has increased a lot. 4 . It has formed a“ blanket (毛毯) ”around the earth. 5 . This makes our earth become warmer and warmer. Therefore,this causes the level of the ocean to rise.

    All these problems are very serious. We must do something to stop our earth from being polluted.

    A. The heat from the sun can’t escape,so the temperature is rising

   B. Too much harmful light from the sun passes through it and reaches the earth directly

   C. Some things weVe done are very good for the earth while some are bad

   D. Around the earth,there’s a special kind of oxygen called“ozone ” 

   E. It mainly comes from different kinds of burning materials

1.       2.       3.       4.       5.      

5. The students can’t go home       they finish cleaning the classroom,for it’s their duty.

   A. when   B. since

   C. if   D. until

4. Look,so many people are running out of the station. I wonder what      .

   A. is happened   B. was happening

   C. is happening   D. had happened

3. Children often       goodbye to their teachers.

   A. speak   B. tell

   C. talk   D. say

5. Be quiet!The baby is        (sleep) !