Read the following article and select the best answer. Article: A small piece of fish each day may keep the heart doctor away. That's the finding of an extensive study of Dutch men in which deaths from heart disease were more than 50 percent lower among those who consumed at least an ounce of salt water fish per day than those who never ate fish. The Dutch research is one of three human studies that give strong scientific backing to the long-held belief that eating fish can provide health benefits, particularly to the heart. Heart disease is the number-one killer in the United States , with more than 550, 000 deaths occurring from heart attacks each year . But researchers previously have noticed that the incidence of heart disease is lower in cultures that consume more fish than Americans do. There are fewer heart disease deaths, for example, among the Eskimos of Greenland, who consume about 14 ounces of fish a day, and among the Japanese, whose daily fish consumption averages more than 3 ounces. During the next two decades, 78 of the men died from heart disease. The fewest deaths were among the group who regularly ate fish, even at levels far lower than those of the Japanese or Eskimos. This relationship was true regardless of other factors such as age , high blood pressure , or blood cholesterol levels . Question: Which of the following is NOT true according to the passage? - The Dutch research has proved that eating fish can help to prevent heart disease. - There is a low incidence of heart disease in countries like Japan and Greenland. - Among all the diseases heart disease is the most dangerous in America. - Heart doctors won't call your house so long as you keep eating fish each day.
Heart doctors won't call your house so long as you keep eating fish each day.

Read the following article and select the best answer. Article: Could cities that float on the sea solve the problems caused by floods and provide food for the world? Some scientists think so. The idea is already being tested and they believe that floating citied will provide more homes for a growing population, without having to use land needed to grow food. And they believe floating areas will allow more food to be grown, so that no one in the world is hungry. In some places, cities that float on the sea are already being planned, A company in the Netherlands called DeltaSync thinks that sea cities will save the world, with more than one in ten people living in them. They say sea cities solve many of the problems the world faces in the 21st century, like not having enough land , more and more people needing homes, fossil fuels running low and the increasingly serious problems caused by floods. DeltaSync says building in the desert is not possible because there is no enough water and that developing ways for people to live in space is still too expensive. So they believe the answer is our oceans, which cover over two thirds of the Earth's surface. Their plans for floating areas include using algae to produce fuel and food. More than a quarter of the land in the Netherlands already lies underwater and scientists there have spent years trying to find ways to deal with it. In the city of Rotterdam they already have floating homes. Bart Roeffen from DeltaSync says: "We have plans for neighbourhoods including roads and, in the end, I believe we can build floating cities on the sea." Question: What is the best title for the text? - Will there be enough water? - Will sea cities save the world? - Is it possible to live in the desert? - Is it expensive to build floating cities?
Will sea cities save the world?

Read the following article and select the best answer. Article: Plants can't communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds ---- chemicals that easily change from a liquid to a gas. A flower's sweet smell, for example, comes from such volatile compounds to attract insects such as bugs and bees. Plants can also discover volatile compounds produced by other plants. A tree under attack by hungry insets, for instance, may give off these chemicals in order to let other trees know about the attack. In response, the other trees may send off their chemicals to keep the bugs away ---- or even chemicals that will attract the bugs' natural enemies. Now scientists have created a quick way to understand what plants are saying: a chemical sensor called an "electronic nose". The "e-nose" can tell such compounds as plants make. When plants are attacked, scientists say, the e-nose could help quickly decide whether plants are being eaten by insects. But today, the only way to spot such insects is to inspect individual plants by observing them. This is a challenging task for managers of greenhouses, including those that can house thousands of plants. The research team is working with an e-nose that can recognize volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds based on the interactions , and then the e-nose will give off electronic signals that the scientists can analyze by using computer software. To test the e-nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all being common greenhouse crops. Then scientists collected samples of the air around damaged leaves from each type of crop. These plants had been damaged either by insects or by scientists who made holes in the leaves with a hole punch . The e-nose, it turns out, can identify healthy cucumber, pepper and tomato plants based on the volatile compounds they produce. It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage... Question: We learn from the text that plants communicate with each other by _ . - making some sounds - waving their leaves - producing some chemicals - sending out electronic signals
producing some chemicals

Read the following article and select the best answer. Article: A study published in September suggests there is a surprising way to get people to avoid unhealthy foods: change their memories. Scientist Elizabeth Loftus of the University of California at Irvine asked volunteers to answer some questions on their personalities and food experiences. "One week later," Loftus says, "we told those people we'd fed their answers into our smart computer and it came up with an account of their early childhood experiences." Some accounts included one key additional detail. "You got sick after eating strawberry ice-cream." The researchers then changed this detail into a manufactured memory through leading questions --- Who were you with? How did you feel? By the end of the study, up to 41% of those given a false memory believed strawberry ice-cream once made them sick, and many said they'd avoid eating it. When Loftus published her findings, she started getting calls from people begging her to make them remember hating chocolate or French fries. Unfortunately, it's not that easy. False memories appear to work only for foods you don't eat on a regular basis. But most importantly, it is likely that false memories can be implanted only in people who are unaware of the mental control. And lying to a patient is immoral , even if a doctor believes it's for the patient's benefit. Loftus says there's nothing to stop parents from trying it with their overweight children. "I say, wake up --- parents have been lying about Father Christmas for years, and nobody seems to mind. If they can prevent diseases caused by fatness and all the other problems that come with that, you might think that's more moral lie. Decide that for yourself." Question: According to the study, people may stop having a certain food if they _ . - think they once had a bad experience of eating it - learn it is harmful for health - lie to themselves that they don't want it - are willing to let doctors control their minds
think they once had a bad experience of eating it