[单项选择]The animals will have a party in the woods. All the animals are invited and they all like to come. A bird sings songs and a monkey dances with her. Butterflies join them and fly happily in the sky.All the animals are invited to a party in the woods.
A. Right.
B. Wrong.
C. Doesn’t say.

[单项选择]The animals will have a party in the woods. All the animals are invited and they all like to come. A bird sings songs and a monkey dances with her. Butterflies join them and fly happily in the sky.Birds and butterflies are singing happily and monkeys and elephants are dancing well.
A. Right.
B. Wrong.
C. Doesn’t say.

[单项选择]

An Interesting Phenomenon

Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles. When a fragrant flavor was added to the vitamin-enriched fluid, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time, however, they broke the habit and went back to where the necessary vitamins were.
In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement, with a wide selection of baby food before them. They were given whatever food they pointed to or appeared interested in. We are told that at first they showed some unusual eating patterns, but that over a period
A. encourage rats to drink vitamin-enriched water
B. find out rats preference in flavor
C. test whether rats know which drink is good for them
D. demonstrate that vitamins are tasteless

[单项选择]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(蝗虫), 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 to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters. This is because they have the colors much like the trees.
Have you ever found an even more strange act A kind of fish in the sea can send out a kind of very black liquid(液体)when it faces danger. While the liq
A. are small animals
B. are easily found by birds
C. are dangerous to their enemies
D. change their colors to protect themselves