Read the article and select the best answer. Article: About five years ago, an American electrical engineer named Scott Brusaw and his wife Julie came up with the idea of putting solar panels on the ground rather than the roof. Then they began to develop the Solar Roadway. The Solar Roadway is an intelligent road that provides clean renewable energy using power from the sun while providing safer driving conditions, along with power and data delivery. They predict that the Solar Roadway will pay for itself through the generation of electricity along with other forms of income and that the same money that is being used to build and resurface current roads can be used to build the Solar Roadways. Each Solar Road Panel measures roughly 4 meters by 4 meters and contains a microprocessor that monitors and controls the panel, while communicating with neighboring panels and the vehicles traveling overhead. The inventors suggest that this provides a communications device every 4 meters on every road which could be used for example to warn drivers of cars which are moving across a centre line and various other speed control problems. The top of the Solar Road panels is made of super-strong glass that would offer vehicles the tractions _ need. According to the inventors, the Solar Roadway creates and carries clean renewable electricity and therefore electric vehicles can be recharged at any conveniently located rest stop, or at any business that has paved Solar Road Panels in their parking lots. The inventors say their Solar Roadway has many functions and advantages from main roads to driveways, parking lots, bike paths, sidewalks and runways. The Federal Highway Administration has given Brusaw $100,000 to develop the invention and Brusaw hopes to build a smart-road parking lot in the coming spring . Question: It can be inferred from the text that _ . Options: A: the Solar Roadway has already been put into use B: $100,000 is only enough to build a smart-road parking lot C: the Solar Roadway is not available for gas-powered cars D: future electric vehicles can be charged anytime and anywhere
C

Read the article and select the best answer. Article: Is there a nationwide shortage of nurses? It's hard to say. However, some characteristic symptoms often indicate that there is indeed a shortage. One symptom is the vacancy rate, or the percentage of budgeted positions that are unfilled. New England's hospitals currently report that an average of 7 to 12 percent of their registered nurse positions are vacant, the highest level since the last shortage in the late 1980s. Vermont has a ly low vacancy rate, at 7.8 percent. But its vacancies were at 1.2 percent just five years ago. Another symptom is the increased use of stopgap measures to fill empty positions. For instance, many nurses report an _ in how frequently they are asked to stay past their shifts. According to Murphy, working in the St. Elizabeth's Hospital, "The shortage has definitely created a lot of opportunities of overtime for our nurses, whether they want them or not." Similarly, a national survey of registered nurses shows that in an average week, nurses in the U.S. work 2.4 more hours than they are scheduled to. Much of this extra time is voluntary, as nurses earn overtime pay when they stay to fill in blanks in the schedule. When they can't fill open positions by more traditional means, health care providers hire temporary staff to tide them over. Travelling workers are the largest part of the temporary health care workforce, hired for thirteen-week reduction at health care facilities facing short-term lack of workers. Temporary workers, mainly nurses, cost hospitals $ 7.2 billion in 2000. "Any successful solution to the shortage depends on convincing more people to become nurses, and that is not an easy goal to reach. To achieve it," says Buerhaus, "society needs to place more value on nursing. Legislation can't do that - it should come from people." And if this continues, we might have to learn to care for ourselves in the hospital. Question: According to Buerhaus, what is a successful solution to the nurse shortage? Options: A: To convince people of the benefits of being a nurse. B: To ask the government for help to work out specific legislation. C: To publicize the past achievements of nurses. D: To make people aware of the importance of being a nurse.
D

Read the article and select the best answer. Article: Dolphins live in a dark underwater world. It's often impossible to see each other or anything else around them, so sound plays an important role in their survival. To communicate with each other, dolphins produce all kinds of sounds. Only other dolphins understand what the sounds mean. Scientists haven't uncovered their secret communication, except for one kind of whistle. It might last less than a second, but this whistle is a big deal. Why? Because these whistles are actually names of dolphins - and every dolphin has one. Scientists call these sounds a "signature whistle." When other dolphins hear the whistle, they know which dolphin is calling. Dolphins often hunt by themselves but still need to stay connected to the group. Since they can't always see each other, dolphins use their signature whistles to check in with other dolphins hundreds of yards away. "In coastal areas, dolphins exchange whistles even when they're a third of a mile apart," says Greg Campbell, who studies animals. That means dolphins shout out to group members that might be nearly five football fields away. What's amazing is who names the baby dolphin. Not the mother. Not an auntie dolphin or another group member. Scientists believe the baby dolphin itself comes up with the signature whistle. Like human babies, a baby dolphin plays with sounds throughout its first year. While testing its sound skills, a baby dolphin is doing something amazing. It's creating or figuring out its signature whistle. How or why it chooses its signature whistle is not clear. Studies show that most of the time the signature whistle is nothing like its mother's or group members' whistles. When the baby dolphin is about a year old, its signature whistle is set. It repeats it often so the other dolphins learn to recognize it. Deciphering dolphin names is just the beginning of figuring out what dolphins communicate about. Do they chat about sharks? Discuss the tides? Maybe they even have a name for people. Someday scientists are to decipher the rest of dolphins'... Question: Sound is important for dolphins because of _ . Options: A: their poor sense of direction B: their living environment C: their strong enemies D: their big groups
B