Look at the centre circles of Diagram (图)A and Diagram B. Which of the centre circles looks larger? In fact, they are exactly the same size.
Then look at the picture on the right. What do you see? A vase? Or two faces？Does the picture change quickly from one to the other again and again? Maybe or maybe not, but you can never see them at the same time.

“What’s happening? Is something wrong with my eyes?” You may wonder at what you see. Don’t worry. Here is how it goes:
When we look at things, our eyes send messages to our brains and then our brains interpret（解读）the information. However, sometimes our brains interpret the received information in a wrong way. It seems that our eyes are playing a joke on us. This often happens and we call it “visual illusion(视觉错误)”.
Movie makers often make use of visual illusions. They make the objects around actors much smaller or bigger than usual. This makes us believe that the actors are much larger or smaller than they usually are. The movies Jurassic Parkand Honey I shrunk the kids just make use of visual illusions.
【小题1】Why does the centre circle in Diagram A look smaller than that in Diagram B?

阅读表达 阅读短文，按要求完成短文后的各项任务。

Christmas is a season to spread joy. Can we spread this joy by caring a little more about nature and going green? Here are some good ideas.

  Reduce the use of the decorative (装饰) lights. Make use of the eco-friendly（环保的）lights on the market. In this way you can save electricity.

  Reuse the wrapping (包装) paper to wrap the gifts. You don’t need to buy new wrapping paper every year. Also try using the same small decorations for your Christmas tree.

  Recycle (循环利用) all those decorations that your can not use any more. You can send out Christmas cards made from recycled paper. It’s a thoughtful way of going green for Christmas. (1)There are many charities selling these cards made from recycled paper.

  There are some other ideal ways to go green for Christmas.

  (2)You can make Christmas _________ by _________. You needn’t go shopping for your family and friends. Homemade Christmas chocolates, handmade soft toys, homemade candles are wonderful. There is a saying that goes, “It is the thought that counts.”

  If you have no time for gifts, you can also invite your family and friends over to have a home cooked meal. They can even help you with the cooking. This can make your relationship stronger.

  Let’s use these green Christmas ideas to celebrate an eco-friendly Christmas!

1.将（1）句译成中文。

2.在（2）句的空白处分别填入一个适当的词使句意完整、上下文通顺。

3.回答问题：Why do we use the eco-friendly lights for Christmas?

4.在文中找出与This can help improve your relationship.意思相近的句子，并将它写在答题卡上。

5.在文中找出最能表达该短文主题的句子，并将它写在答题卡上。

The world is not only hungry but also thirsty for water. This may seem strange to you, since nearly 70% of the earth’s surface is covered with water. But about 97% of that is sea water or salt water. Man can only drink and use the other 3% of fresh water from rivers, lakes, underground and so on. And we can not even use all of that because some of it has been made dirty.

Earth Day is April 22. But on all other days, we must also remember how important water is. The water that we use is the most important natural resource on the earth. Today we face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too.

How do cars and factories make our water dirty? First they pollute the air. Then when it rains, the rain water makes our drinking water dirty. Dirty rain, called acid rain is also bad for plants, animals and buildings. Scientists say that in 30 years, more than half of the people in the world won’t have enough clean water. We have to learn how to stop wasting water. One of the first steps is to develop ways of reusing it. Today in most large cities, water is used only once and then sent out into a sewer system (下水道). From there it returns to the sea or goes underground.

But even though every large city reused its water, we would still not have enough. So we should make use of sea water by removing the salt in it. If we can take these steps, fresh water won’t be used up.

1.The world is thirsty for water because _______.

A. we don’t have enough fresh water      B. a lot of water goes into sewer systems

C. only 70% of the earth’s surface is water                  D. sea water is widely used rather than fresh water

2.From this passage, we know acid rain _______.

A. is only bad for living things       B. is not bad for buildings and factories

C. can be produced in factories        D. is bad for people, animals, plants and buildings

3.One difficult way we can solve the problem is to _______.

A. use the water with salt in it           B. remove the salt from sea water

C. get water from underground              D. reuse the water in cities

4.What is the best title for this passage?

A. Fresh water and sea water               B. A thirsty country

C. The importance of water  D. The world’s water problem

Look at the center circles of Diagram (图) A and Diagram B.  Which of the centre circles looks larger? 

Take a first look and you probably think that the centre circle in Diagram A is smaller than that in Diagram B. In fact , they are exactly the same size.

Then look at the picture on the right. What do you see? A vase ? Or two faces? Does the picture change quickly from one to the other again and again? Maybe or maybe not, but you can never see them at the same time. 

"What's happening? Is something wrong with my eyes?" You may wonder at what you see. Don't worry. Here is how it goes:

When we look at things, our eyes send messages to our brains and then our brains interpret (解读) the information. However, sometimes our brains interpret the received information in a wrong way. It seems that our eyes are playing a joke on us. This often happens and we call it "Visual illusion" (视觉错误). 

Movie makers often make use of illusions. They make the objects around actors much smaller or bigger than usual. This makes us believe that the actors are much larger or smaller than they usually are. The movies Jurassic Park and Honey I shrunk the kids just make use of illusions.

1.The centre circle in Diagram A looks smaller than that in Diagram B. That's because           .

A. something is wrong with our eyes

B. the two circles are not the same size

C. our brains interpret the information in a wrong way

D. the two pictures change quickly from one to the other

2.What's the right order according to the passage?

a. We look at things with our eyes.              b. Our brains interpret the messages.

c. Our brains tell us what we have seen.      d. Our eyes send messages to our brains.

A．adbc

B．cabd

C．acdb

D．bcad

3.Movie makers make use of visual illusions to            .

A．help the actors look better

B．make the actors much braver

C．help the actors become stronger

D．make the actors seem different in size

4.In the picture on the right, it seems that Line AB is shorter than Line CD, but in fact Line AB is as long as Line CD. Which paragraph can explain what has happened to our eyes?___________

A.The second one.

B.The third one.

C.The fifth one.

D.The sixth one.

5.The text is probably taken from            .

A．an advertisement

B．a science book

C．a movie magazine

D．a story book