Researchers conducting a study of hospital stays for over two hundred and eighty six thousand older folks found something interesting in their data. The number of hospitalizations for heart disease and stroke went down significantly among a certain group of people at a certain time of year. What folks, and what time of year, you ask? Flu season and the lucky people were the ones who got flu shots . It's generally recommended that people over fifty get their flu shots every year. Influenza is no small thing. it's responsible for around thirty six thousand deaths a year in the U. S. alone. Getting the shots also cuts down on the chances of getting pneumonia , which is especially dangerous in seniors. But what wasn't known was that there seems to be an added benefit to getting a flu shots in terms of _ heart problems. The data,in fact, are quite strong in suggesting this is the case. In this study, flu shots cut clown the number of hospitalizations for heart disease by nineteen percent. Stroke went down sixteen percent one season and a whopping twenty-three percent a second season.These are big results. So what's the connection between getting a flu shot and having a stronger heart? It isn't yet known. Researchers speculate that the flu virus itself may do damage to blood vessels , possibly making clots more likely. Blood clots in the heart can cause heart attacks, and blood clots in the brain can cause strokes. Whatever the specific details are, there's one more good reason to follow your doctor' s advice and get that annual flu shot. According to the study, the number of hospitalizations for heart disease and stroke went down significanntly among the ones who _ . A) got flu shots after they were ill B) got flu shots before they were ill C) got flu shots at the flu season D) got flu shots whenever convenient
C

People have always wanted to speak with animals. There are many books about this, especially children books. Now there are also movies, such as Dr. Doolittle. When you watch animals, it seems clear that they can communicate with each other. Many people wonder why people can't also communicate with them. Scientists know how some animals communicate. Bees, for example, use their bodies. They do a kind of dance to give information about food. Birds, on the other hand, share information with sounds. They use certain sounds to protect their homes and to stay together when they fly. Some male birds use lovely songs to attract a female . Other animals communicate with both body movements and sounds. For example, dogs wag their tails when they are happy, and they bark when they are excited. People used to think it was possible to teach human language to animals. Parrots and other birds, for example, can learn to say words. But the birds just repeat the words. They don't understand them. Some American scientists tried to teach English to chimpanzees , close s of human beings. However, this was impossible. Chimpanzees can't move their mouths the right way. They could never learn to speak like people. Then scientists tried to teach human language to chimpanzees in other ways. Some tried with American Sign Language (ASL). Others tried with a simple computer. But chimpanzees could only learn to use a few words. They could never learn to use grammar. Their brains are very different from the brains of human beings. Now some scientists are studying the same points between human and animal language. In fact, some animals use sounds like people do. Dogs, for example, use an unpleasant, low sound to tell other dogs to stay away. People, too, use that kind of voice to say the same things. A dog's noisy bark communicate that something is happening. People use the same high tone when they shout, "Watch out!" Scientists want to understand the language of other animals, such as whales and bears. To do this, they go... Some birds can learn to say words, _ . A) but they don't really know the meaning B) and they make up new words, too C) and they use grammar, too D) but they forget them quickly
A

There's a whole lot of things that people fill their stomachs with. Some of them keep people alive. Some of them taste good to people. Some of them help people win pie-eating contests. Alcohol does none of these things. Why do people keep drinking it? And what does it do once it gets to their stomachs? There are all kinds of alcohol molecules , but the one that people most often pour down their throat is ethanol . Ethanol is very tiny and it dissolves in water, so it gets into all sorts of places that it's not supposed to. Alcohol heads for the digestive system. Because it dissolves in water, it can get into the water in the bloodstream. Because ethanol, to a certain extent, can pass through cell membranes . It can go almost anywhere. It spreads through the muscles, and is sweated -- unmetabolized and whole -- through the skin. It gets into the heart. It even takes a walk through the brain, and this is the secret of its powers. Alcohol depresses the nerves, and the nerves affect almost every area of the body. Enough alcohol makes people sleep, so people who become unconscious choke on their own vomit . Most worryingly, enough alcohol can shut down those parts of the brain just like any other parts. People become unconscious and their brains simply forget to breathe. Alcohol is broken down in the liver. Alcohol doesn't destroy the liver, but products that the liver breaks the alcohol into do cause damage. A glass of wine per day can not do any harm. Instead, it can prevent heart attacks or can make someone functionally young. And it is kind of nice to know that sometimes, relaxation and cheer can be bottled. All that's needed is to take care how much alcohol is let into a person's brain. Why can alcohol reach the brain? A) Because it can move through water molecules in the blood. B) Because it is small enough to get through any narrow space. C) Because it is so light that the bloodstream can transport. D) Because it is absorbed only by the cells in the stomach.
A

Did you know that there are actually people who have paid for a flight to the moon? In the future, there will be a lot more opportunities to travel to faraway places than now... perhaps even as far as the moon. As people adventure further and further away and as planes, trains, cars, and rocket ships become faster, is it safer to have these vehicles controlled by humans or by computers? While many flights by plane are controlled automatically by machines, most people today wouldn't let their car drive itself. That's because currently the autopilot function on your car can only keep it on the same course you are travelling on. It won't turn the car right or left. It won't stop if an animal jumps in the way. However, cars today can sense when something is too close and warn the driver with flashing lights and alarms. Many cars also have GPS(global positioning systems) that tell drivers which road to take and when to turn. These systems, unlike human drivers, never get lost. In the future, it is easy to believe that your car will be better able to drive itself with the aid of computers that can determine the position of your car and the speed it should travel at. In addition to computers being 'smarter' than people regarding the best way to go or knowing how close another vehicle is, computers don't get sick, tired, or angry. This means they won't make the same mistakes that people make when they are not having a good day. While responding with emotion is a good thing when choosing the best way to deal with a friend's personal problem, it may not be such a good thing when deciding what to do at the wheel of a fast-moving vehicle. So what are the disadvantages of autopilot systems? Maybe one disadvantage is that a small computer problem could cause a serious accident. It could also be argued that in unexpected situations, computers might not be able to respond appropriately; some decisions require human emotions. Another problem might be that if everything were controlled by computers or robots, people wouldn't... Which of the following is the disadvantage of an autopilot system? A) It won't make the same mistakes as people do. B) It can point out the best route for the driver. C) It might not respond properly to unexpected situations. D) It does not have human emotions to influence its function.
C