Read the article and select the best answer. Article: Besides providing an ideal environment for sea plants and animals to live in, seawater has other values, one of which is that it constantly moves, and its movements produce energy. The most obvious movements are waves and the tides. Winds causes the waves, and the gravitational pull of the moon and the son causes tides. In places like the Bay of Fundy in Canada, the difference between the high and low tide level can be as much as 40 feet. France and Britain are now trying to use energy in the tides to produce electricity. Waves can produce electricity and some experiments are taking place to learn more about this. One of the most encouraging areas of research uses the difference between the temperature of seawater at the surface and deep down to produce electricity. Question: According to the passage, which of the following is not true? Options: A: The temperature difference of seawater can produce electricity. B: The energy in the tides can produce electricity. C: Waves can produce electricity. D: The plants and animals in the ocean can produce electricity.
B

Read the article and select the best answer. Article: Why are people interested in eating raw foods or whole foods ? One reason is that eating these types of food reduces the risk of acid accumulation in your body. Raw and whole foods are usually digested more efficiently than cooked foods. When we cook foods, we destroy the natural enzymes that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream. In both instances, the result is overweight. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive system, where it becomes increasingly acidic. To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs. Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we've had enough to eat; as a result, people often overeat. Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body's cells. The body's metabolism becomes inactive, and the result is weight gain and obesity. The accumulation of acid in the digestive system makes digestion increasingly inefficient. When that happens, even healthy foods can become acidic and the food allergies will become more common. To stop this vicious circle in its tracks, people need to consume food and supplements that will neutralize the acid already accumulated in body. Eating the right types of raw and whole foods can help. It's also important to restore your enzyme balance. You need to identify and avoid the foods that cause... Question: Processed foods are unhealthy because they _ . Options: A: destroy body's cells B: harm your stomach C: may lead to obesity D: stop body's natural function
C

Q: Read the article and select the best answer. Article: It is obvious that television brings us not only advantages but also disadvantages . At first, television is both a convenient channel of amusement, and a ly cheap one. If we have a TV set in the family, we are not necessary to go to the cinema or theatre to enjoy programme with expensive tickets. All that they have to do is press a button with a finger, and they can watch all the programmes they like, such as TV talk shows , movies, opera and so on. But some people think of it as a danger. When we watch TV, we don't need to do anything . We do not even have to leave our sofa because we have a remote control in our hand. We don't need to make any judgment or statement about it. We are totally passive and don't use our head to think hard about some matters. As we all know, television keeps us informed about world events--including all the events in society, science and politics .We can get a good idea of the most remote countries and the strangest customs in their country. Of course the radio performs this service too, but the effect of the programme is not better than on the television. Everything we enjoy on the television is much more vivid and realistic. However, in turn there is a great danger. Usually we cannot resist the television screen, because it has a great harm for us. We have been so accustomed to enjoying the screen, so dependent on its pictures. But when our TV sets are out of order, we are surprised to find that we have much more time to do things. And at this time we actually begin to have a talk to each other again. It is really worth thinking. Of course the arguments about the advantages and disadvantages of television are on the go.We can not simply say television itself is good or bad. The truth is that how we use it determines its true value to our society. Question: According to the passage , whether TV is good or not depends on _ . Options: A: its quality B: people's attitude towards it C: how we use it D: when we use it
A: C

Read the article and select the best answer. Article: More often than not, the person sitting next to you on a plane or sleeping in the next hotel room has paid more or less than you did for the same services. Each day, airlines give more than several hundred fares for flights between the same two cities and hotels charge different rates for the same room. So how do you find the best rates? Here are some tips: ^ Sign up for fare special e-mails. When airlines get into a fare war, the cost of a plane ticket can fall overnight and the discounted fare may be sold out by noon the next day. Get on the mailing list of airlines and other travel Web sites so you can be told immediately if fares drop. ^ Buy your tickets at least 21 days in advance. There are usually four different timetables for advance tickets: 21-day, 14-day, 7-day, and 3-day. The further in advance you book your flight, the lower the fare you will find. ^ Consider another airport. Find out about all the airports that are near your destination city. You might be able to fly into a smaller airport or neighboring city at a much lower rate. ^ Stay over a Saturday night. Airlines give the highest fares to business travelers, who fly during the week and spend their weekends at home. If you plan to leave for your trip on a Wednesday and return on Saturday, your fare would be a lot higher than you stay until Sunday morning. ^ Fly on Tuesdays, Wednesdays, and Saturdays. Some airlines offer cheaper fares on different days of the week. Generally, it's the cheapest to fly on Tuesday, Wednesday, and Saturday. Remember, though, that a Saturday stay is necessary to receive the lowest rate. ^ Pick a flight with plenty of open seats. Seats in a flight are divided into "classes", and each class has its own price. Since the cheapest classes sell first, the fewer seats that are left on a plane, the more expensive they are. Question: If you are a business traveler, you want to save money. What should you do? Options: A: Ask the manager of the air company to cut down the price of the ticket. B: You'd better stay one more night and not go home on Saturday C: You'd better fly during the week and spend your weekends at home. D: Never go abroad on business during the weekend alone.
B