Ques: We know that many animals do not stay ill one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowed. When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of the fish, which is called "salmon" . This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is cold, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea. Recently, scientists have studied the migration of a kind lobster . Every year, when the season of bad weather arrives, the lobster get into a long time and start to walk across tile floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another, but at other times we don't. Maybe living things just like to travel. ,. The mice in northern Europe leave their mountain when _ . A) they give birth B) the weather is bad C) the place get too crowded D) they haven't enough food
Ans: C

Ques: One day, a little monkey and a little fox went out to play. They saw an apple tree on the other side of the river. There were many big and red apples on it. But there was no bridge over the river. The monkey thought hard and had an idea. They pulled down a tree and put it over the river as a bridge. The monkey said, "My old friend, you go there first." But after the fox went to the other side, he kicked the tree into the river and ran to the apple tree. "How can I get 'there without the tree?" cried the monkey. The fox laughed and said, "You just stand there and watch me eating the apples." The monkey was very angry. Suddenly it began to rain. The water level in the river rose and the tree flew away with the water. "You can eat all the apples. But you can't come back," shouted the monkey. The fox stopped eating and looked at the monkey sadly. ,. The fox kicked the tree into the river because he wanted to _ . A) eat all the apples by himself B) share the apples with the monkey C) get the apples first D) play a joke on the monkey
Ans: A

Ques: Two hunters rented a small plane to fly them to a forest. They told the pilot to come back and pick them up in about two weeks. By the end of the two weeks, they had hunted a lot of animals and they wanted to put all of them onto the plane. But the pilot said, "This plane can only take one lamb. You'll have to leave the others behind." Then one hunter said, "But last year, another pilot with the same plane let us take two lambs and some other animals onto the plane." So the new pilot thought about it. Finally he said, "OK, since you did it last year, I think this year we can do it again." Then they put all the animals they had hunted onto the plane, and the plane took off. Five minutes later, it crashed. The three men looked around, and one hunter asked the other one, "Where do you think we are now?" The other hunter looked around and said, "I think we're about one mile away from the place where the plane crashed last year." This year, what happened to the plane at last? A) It crashed. B) It didn't work. C) It landed on an island. D) It only flew one mile.
Ans: A

Ques: If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors? As we know, scattering happens when light goes through the air. For the same media, if the wavelength is long, the scattering will be short. If the wavelength is short, then the scattering will be long. Of all light we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days. Using the red light can help drivers in farther areas see the lights. It helps drivers slow down or stop in time. If drivers don't see the red light until they are close, they may not be able to stop the car in time. An accident may happen. Red can also excite people. We can act more quickly when we see the color red. In a word, red light helps drivers stop in time and help prevent accidents. _ has the longest wavelength of all light we can see. A) Red B) Green C) Yellow D) Black
Ans:
A