Q: Do you have a good memory? Maybe you remember better than all of your friends. But even if you have a short-term memory, it's better than a chimpanzee's , right? Well, you may be wrong. Tetsuro Matszawa, a scientist from Kyoto University, Japan has showed how chimps have far better memories than humans. "We learn that chimps have great memories by doing tests," he told The Guardian "You can do things to improve your memory." How do chimps have better memories than us? Scientists tested four chimps and human volunteers. They showed them five numbers on a computer screen. Chimps and human volunteers had to remember the numbers correctly. But to make it hard, the numbers disappeared after seven tenths of a second. Then they will reduce the time to two tenths of a second. While humans began to make mistake after mistake, the young chimps still did very well. Why do they have better memories? We share 98.8 percent of our DNA with chimps. But during evolution , we lost some of our shared abilities. As humans learned new skills, like language, we had to lose some of our memory skills to make room in our brains. "To get something, we had to lose something," said the scientist. Chimps need good memories to survive . When a chimp looks up at the big tree and pick a banana, he must remember where he saw it as he fights off competition from other animals. During evolution, humans _ . A) lost 98.8 percent of their DNA shared with chimps B) needed very good memories to survive C) gained skills but also lost skills D) learned to compete against chimps
A: C

Q: Early to bed, early to rise, makes a man healthy, wealthy and wise. This is an old English saying. Have you heard of it before? It means that we must go to bed early and get up early in the morning. Then we shall be healthy. We shall also be rich (wealthy) and clever (wise). This is true. The body must have enough sleep to be healthy. Children of young age should have ten hours' sleep every night. Children who do not have enough sleep cannot do their work very well. They will not be wise and they may not become wealthy! The body also needs exercise. Walking, running, jumping, swimming and playing games are all exercise. Exercise keeps the body strong. Exercise also helps the blood to move around inside the body. This is very important. Our blood takes food to all parts of our body. The head also needs blood .Exercise helps us to think better! Exercise makes the _ move quickly and smoothly A) body B) blood C) children D) head
A: B

Q: Is there intelligent life on other planets? For years, scientists said "no." or "we don't know." But today this is changing. Seth Shostak and Alexandra Barnett are astronomers . They believe intelligent life exists somewhere in the universe. They also think we sill soon contact these beings(;). Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. "This is long enough for other planets to have intelligent life," say Shostak and Barnett. The second reason is size--the universe is huge. "Tools like the Hubble Telescope have shown that there are at least 100 billion galaxies," says Shostak. "And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth." In the past, it was hard to look for signs of intelligent life in the universe. But now, powerful telescopes allow scientists to discover smaller planets--the size of Mars or Earth--in other solar systems. These planets might have intelligent life. Have beings from space already visited Earth? "Probably not," says Shostak. "It's a long way away. However, intelligent beings may contact us in other way, such as radio signals . In fact, they may be trying to communicate with us now, but we don't have the right tools to receive their messages. However, this is changing. By 2025, we could make contact with other life forms in our universe and we might help each other." Seth Shostak and Alexandra Barnett are _ . A) astronomers B) farmers C) singers D) drivers
A: A

Q: At the beginning of the world,a man named Ekon lived in Luzon.He liked to build things.He thought it would be a very good idea to build a bridge to the sky. As he wanted the bridge to be strong and last a long time,he built it of stone.He worked for years and years to build the bridge.His wife and children,nephews and nieces,uncles and aunts,all helped him.Though they worked very hard,the sky always seemed to be a long distance away. When Ekon became an old man,his wife and children told him that he would never finish it. "If I can't finish it." he said."my children's children will do so." But just before he died,his wife and children told him that they could not find any more stones. So Ekon became very angry and disappointed.Though he was very old and weak,he pulled down the bridge.It came tumbling with a great roar . The stones made great heaps all over the country.These great heaps of stones are what we now call mountains.Ekon was _ under one of them himself. Who had the idea to build a bridge to the sky? A) Ekon. B) A man. C) Ekon's wife and children. D) We don't know.
A: A