Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: What is colour? Why do some of the things around us look red, some green, others blue? Colours are really made by reflected light. We see colour because most of the things reflect light. Something is red, for it reflects most of the red light. In the same way, if something is green, it reflects most of the green light. If something reflects all light, it is white. If it doesn't reflect any light, it is black. Some of the light is reflected and some is taken in and turned into heat .The darker the colour is, the less light is reflected, the more light is taken in. So dark-coloured clothes are warmer in the sun than light-coloured clothes. Options: A dark-clolured clothes B red-coloured clothes C green-coloured clothes D light-coloured clothes Answer: D light-coloured clothes Question:

A: In summer _ make people feel cool.

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: "Everybody loves a bargain." One person's useless, ugly, or broken object can be another person's bargain. That is why so many Americans do not throw things away. They put them outside their houses. They put on a "For Sale" sign. And, as simple as that, they have a yard sale. The sellers put a paid announcement in a local newspaper. It tells when and where the yard sale will take place. These sales are very popular during weekends in spring, summer, and autumn. Early in the morning, all the things to be sold are carried out of the house. Then they sit all day in the sunlight---like tired guests at a party---waiting for someone to take them home. Just about anything can be sold at a yard sale. Sometimes, there are more clothes than anything else. Cooking equipment is also popular. So are old toys, tools, books, tables and chairs. Then there are objects called "white elephants". A white elephant is something you think is extremely ugly or useless. It may be an electric light shaped like a fish. You feel a sharp pain whenever you look at it. To someone else, however, it might be a thing of beauty and joy. Some people go to yard sales to find a special thing that they collect. It may be old toy trains, for example, or painting of dogs. Experts say more Americans are collecting old things now than ever before. Most people who go to yard sales, however, are not looking for anything special. They might buy an object simply because it costs so little. They enjoy negotiating over prices, even if they really do not need the object. Later, they may hold their own yard to sell all the things they have bought. Options: A It may not be held when the weather is very cold. B It can last for a whole day. C It is usually held with a party. D It is held outdoors. Answer: C It is usually held with a party. Question:

A: Which of the following is NOT true about a yard sale?

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: Back in the 1860s, a British scientist named Henry Walter Bates noticed something interesting in the animal world: a kind of butterfly, Common Mormon, can change the pattern on its wings so that it looks like another butterfly species, the Common Rose, which is poisonous for birds to eat. Bates argued that animals develop this ability to protect themselves from being eaten. This theory had been widely accepted by scientists. But one question remains: how do these animals manage to do that? After more than 150 years, scientists are finally able to answer that question--it is all down to a gene called "doublesex", according to a study published on March 6 in the journalNature. In fact, scientists have long known that genes are responsible for this useful ability. But until the new study, scientists hadn't been able to find out which genes in particular were responsible. Scientists at the University of Chicago compared the genetic structures of the Common Mormons that changed their wing patterns with those of ones that did not. And all the results pointed to a single gene, "doublesex". This was much to the scientists' surprise. They used to expect that something as complex as this would be controlled by many different genes. For example, one gene would control the color of the upper part of the wing, one would do so for the lower part. However, the "doublesex" gene doesn't quite do everything by itself. Instead, it acts like a switch--it "tells" other genes to change the wing patterns. Isn't that clever? Scientists believe that this special ability of the "doublesex" gene on Common Mormon was developed throughout the long history of evolution. "The harmless species gains an advantage by resembling something predators avoid," Sean Carroll, a scientist toldNature. "it was obvious evidence for natural selection. " Options: A By doing experiment on butterflies. B By comparing genetic structures. C By observing the butterflies. D By analyzing the result. Answer: B By comparing genetic structures. Question:

A: How do scientists find the truth of butterfly changing wing patterns?

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: Are you nervous about climbing because you think it's too dangerous? Do you feel you're not fit enough to climb? Do you know how to start climbing? Let's consider the idea that climbing is dangerous. Being afraid is natural, but if you use suitable ropes and other climbing equipments you will feel completely safe. Climbers are usually very careful because they know what they are doing is dangerous. Accidents happen, but when they do, they tend to attract a lot of publicity. As a result, people think there are many more accidents than there are in reality. You cannot expect to start climbing straight away. Climbing is a challenge and challenges take time. It is necessary first of all that you achieve a good level of fitness. Begin as soon as you become interested in climbing--go to the gym, go swimming, take up jogging and continue to do so throughout your training period. Discover as much as you can about climbing. Visit the library and find books especially for beginners or buy climbing magazines and look for articles which describe your situation. Look up information on the Internet. Find out about equipment, methods and places to go. Next, take a course on a climbing wall. There are plenty of climbing walls all over the country which have trained and qualified people as instructors. Call your local leisure centre to find out if there is one in your area. These training sessions are a quick way to get experience and you are likely to meet other beginners. After this, you can do an outside course or join a club where you can meet climbers of all abilities and eventually join in group-climbing events. At first you may not understand the importance of a good training period, but after you have completed your first climb and you are standing safely at the top of a rock feeling thrilled, then you will know was the right thing to do. Options: A join a club you like B become qualified instructors C gain controlled experience D take part in group-climbing events Answer: C gain controlled experience Question:

A:
By climbing walls you can _ .