(   )43. Which of the following can be true according to the passage?

A. The clam opened his shell first.       B. The bird removed his beak first

C. The clam and the bird didn’t agree with each other until the young man came

D. The clam and the bird were cooked as a good dinner by the young man

(   )44.Which of the following sayings can explain the story well?

A. Two dogs fight for a bone, and a third runs away with it.

B. Two heads are better than one.

C. Think twice before you do

D. Saying is one thing and doing another

(   )45. The best title of the passage is _________.

A. Remove it first      B. A daydream

C. A stubborn bird      D. The bird and the clam

D

Look at the center circles of Diagram (图)A and Diagram B.

Which of the centre circles looks larger? 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 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 Park and Honey I shrunk the kids just make use of visual illusions.

(  )46. Why does the centre circle in Diagram A look smaller than that in Diagram B?

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