During the 19th century, scientists found that when certain parts of the brain of a person were hurt, he would lose the power of doing certain things. And so people thought that each part of the brain does a different job. But modern research has discovered that this is not so, for it is not easy to show exactly what each part of the brain does. In the past fifty years there has been a great increase in the amount or research done on the brain. Scientists have found out that the way the brain works is not so simple as people in general may think. Chemists tell us that about 100,000 chemical changes take place in the brain every second. Some recent researches also suggest that we can remember everything that happened to us. We may not be able to think of the things we have heard and seen but it is kept there in the store-house of the human mind. Earlier scientists thought that the power of one's brain got weaker and weaker as one grows older. But it is plenty of exercise, it keeps its power. It is now thought that is not true. As long as the brain is given plenty of exercise, it keeps its power. It has proved that an old person who has always been active in the mind has a quicker mind than a young person who has done physical work without using much of his brain. The more work we give our brains, _ . A) the less result we will gain B) the more work they are able to do C) the weaker their power will get D) the more tired they will feel
B
Alaska polar bears are losing their fur and U.S. Geological Survey scientists don't know why. In the past two weeks, nine of 33 bears checked by scientists in the southern Beaufort Sea region near Barrow were found to have alopecia -- loss of fur, said Tony DeGange, chief of the biology office at the USGS Science Center in Anchorage. Three of four bears inspected Thursday near Kaktovik showed the symptoms as well. Scientists have been collecting blood and tissue samples from the suffering bears, but they do not know the cause or the significance of the outbreak, the Anchorage Daily News reported. "Our data set suggests that this is unusual but not unprecedented," DeGange said. Ten of 48 bears checked by the team in 1998-1999 had a similar condition, he said. In a long-standing project, the USGS has sent polar bear research teams to the area since 1984. The teams track and examine the bears to help determine their general health and habits. This year they saw their first bear with hair loss on March 21. The team will end up this year's operations in May when the sea ice becomes too dangerous for safe travel. "We took biopsies in 1999 and couldn't establish a causative agent for the hair loss then," DeGange said. "But now we have this unexplained death event going on with seals . And they haven't been successful in figuring out what caused the seal deaths. Is it just a matter of coincidence or is it related? We don't know." In December 2012, the National Oceanic and Atmospheric Administration declared an "unusual death event" based on a number of ringed seals found on beaches on the Arctic coast of Alaska during the summer. Dead and dying seals were found to have hair loss and skin sores. Affected seals were later observed in Canada and Russia. What would be the best title of the passage? A) Loss of Fur Broke out Without a Reason B) Loss of Fur Threatens World Wild Animals C) Some of Alaska's Polar Bears Are Losing Fur D) Long-standing Project Researching Loss of Fur
C
Q: Many scientists are now exploring the idea of going to live on Mars. Some other scientists from the MASA AMES Center have already started the creation of a "Mars town" and many others are in fact already experimenting with it. Of course, these experiments are done on Earth itself but this "Mars town" has an environment practically like that of Mars. The astronauts working in these towns wear their space suit and also do everything they would really have to carry out if they ever go to Mars in the future. But Mars would be like Earth, a temporary place for humans. When the Sun starts swallowing up the planets, Mars will disappear only hours after Earth. So Mars only seems to be the ideal place to spread the human beings. It is also a good location to send humans if ever there is a disaster on Earth. By saying disaster, I mean asteroids hitting and things like that. If we humans do not want to disappear when Earth or Mars gets swallowed up, we will have to go and live beyond the solar system. But are there any planets outside our solar system prepared to support life? Astronomers' answer is: "If Earth can support life, why can't other planets do the same too? Astronomers have already discovered a Jupiter - like planet _ a Sun-like star, so why not an Earth-like planet orbiting a Sun-like star? To achieve this goal though, many other problems have to be taken into consideration. How do we transform a dusty planet like Mars into one more or less like our Earth? How should we go on? There is still a long way to go. Which of the following would be the best title for this passage? A) Mars Town B) Living on Mars C) The Future of Earth D) Where to live in the Future
A: D
(Question)
Do you know a child who has used first aid to save a life or help an injured person? St.John Ambulance is seeking young people who have acted quickly, calmly and effectively at a real emergency for its annual Young First Aider of the Year awards. The awards are open to all those under 18, and the closing date for nomination is April 30, 2016.The winners will be invited to attend a special ceremony in June, 2016. "St.John Ambulance believes it is essential for young people to learn first aid so that they can help anyone who is injured," said Sandra Stocker, director of St.John Ambulance Awards Committee."The Young First Aider of the Year is a wonderful way to celebrate their bravery and quick-thinking." Nomination for the Young First Aider of the Year is now open.Please complete and return the nomination forms as soon as possible and certainly no later than April 30, 2016.The committee will decide which of the nominees will receive the Young First Aider of the Year awards by considering the actions of the nominees along with their ages and other factors.You should send any evidence you have with the nomination form, showing the nominees' actions. Examples of evidence could include: * Newspaper clippings of the incident. * Police incident record numbers. Once a nomination form is received, the nominee or nominator may be approached for further details of the incident.For further information please get in touch with Sandra Stocker by email or on 020-73244082 or 020-732440813. Find out who our winners will be for 2016. If you suggest someone for the awards, you should _ . A) attend the awards ceremony B) make a speech introducing yourself C) provide the details of the incident D) have a good knowledge about first aid
(Answer)
C