Birds live in the trees. Squirrels（松鼠） live in the trees. But do you know that some frogs（蛙） live in the trees, too?

The tree frog is hard to find. It can change colors. On green leaves, it stays green. On a brown branch（树枝）,it turns brown. Some tree frogs can change from green to gold（金黄色） or blue.

Tree frogs have legs and wide feet. They have sticky pads（黏性的肉趾） at the end of their toes. These sticky toe pads keep the tree frogs from falling off the trees. Tree frogs have different colors and markings（斑点） on their skins. Their eyes are different, too. Some have green eyes, and others have bright red ones.

The sounds they make are different, too. One frog makes a sound like a dog barking（狗吠）.Another frog makes a loud noise like a snore（打鼾）.There is even a frog that whistles（吹口哨）！

1. According to the passage, these frogs are hard to find because________.

A. they stay in trees?????????? B. they can change their colors

C. they have sticky pads?????? D. they make surprising sounds

2. The color of tree frogs on green leaves is________.

A. gold????????????? B. brown????????????? ????????????? C. green????????????? ????????????? D. blue

3.What sounds can the frogs make?

A. like a dog barking????????? B. like a snore

C. like a whistle????????????? D. A,B and C

4. Which of the following sentences is RIGHT?

A. The tree frogs have different colors and markings on their skins.

B. The tree frogs can’t make a loud noise like a snore.

C. We can easily tell tree leaves from tree frogs.

D. We still can’t find tree frogs if we hear a sound like a snore in the forest.

5. The passage is mainly about________.

A. the colors of a special frog??????? B. the sounds of a special frog

C. the eyes of a special frog????????? D. something about tree frogs

Ruby, the artist, is an Asian elephant, She is17 years old. She lives in the zoo. Ruby has produced about 100 paintings since last year. She has made more than $ 40,000 for the zoo. Zoo leaders say Ruby first showed the talent (才能) about four years ago. Zoo workers watched her make the marks in the sand with her trunk. She rubbed (擦掉) out the marks, then made the new ones. The zoo worker gave her brushes and paints. Soon Ruby painted pictures.
Newspaper reporters wrote Ruby, then people asked about buying her pictures. And in this way, she made a lot of money for the zoo. This is how Ruby does the paintings. A zoo worker holds different color paints. Ruby touches the colors she wants. Then the worker gives her brushes with the chosen colors in her trunk and Ruby begins painting.
【小题1】We can most probably read this story_______.

Do you know why different animals or pests have their special colors? Colors in them seem to be used mainly to protect themselves.
Some birds like eating locusts. but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life, you'll find the main use of coloring is protecting themselves. Bears, lions and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colors much like the tree.
Have you ever noticed an even more strange act? A kind of fish in the sea can send out a kind of very black liquid when it faces danger. While the liquid spread over, the enemies cannot find it. And it immediately swims away. So it has lived up to now though it isn't strong at all.
根据短文内容, 指出能完成所给句子或回答所提问题的最佳答案。
【小题1】From the passage we learn that locusts ___ .