Read the following article and select the best answer. Article: Wind turbines are efficient sources of cheap energy but also a source of concern as their huge spinning blades frequently kill birds and bats. A new type of wind generator developed in Spain offers a creative solution to that problem. In 2002, Spanish inventor David Yanez saw a short film about the Tacoma Narrows Bridge in the U.S., collapsing in strong wind. It was a vivid example of the powerful vibrations wind can create when it blows past a long pole, such as a car antenna or even a stick of bamboo. It gave him the idea for a new type of wind-energy generator. "The initial philosophy or spirit was to create a generator of dreams that had all the qualities one would want: It should be as cheap as possible, need as little maintenance as possible, the setup as simple as possible," he said. Yanez and his friend Raoul Martin took the idea to an engineering firm, where they were told it would never work. Undiscouraged, they started experimenting on their own in a small wind tunnel they built. Good initial results were repeated by a larger working model called Vortex installed in a nearby field. "What we have is a mast , which is the top piece and acts as a blade," Yanez said. "It's constructed from the same material as a conventional generator, and what it does is it oscillates , transmitting the oscillation to a conventional alternator, which by its own oscillation converts the wind's energy into electric energy." Yanez said the output of the 6-meter-tall generator, and even that of smaller models, was better than expected. The Vortex creates about 30 percent less energy than a comparable bladed wind turbine, but it is lighter and cheaper to build and maintain. It is made mostly of reinforced plastic and has very few moving parts. Also, it does not create noise and--even more important for many environmentalists--it does not present a threat to passing birds. The current prototype works at wind speeds ranging from 1.5 to 7 meters per second. The inventors say the next step is building a 12.5-meter tall... Question: The author mentions a short film about the Tacoma Narrows Bridge to show _ . - what the initial philosophy or spirit was - what inspired Yanez to create the generator - how the bridge was destroyed in strong wind - how wind creates powerful vibrations
what inspired Yanez to create the generator

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Read the following article and select the best answer. Article: Next Stop: Planet Mars Fly me to the moon? That's not far enough. On September 14, 2011, NASA released designs for a superrocket, the Space Launch System (SLS). This time the final destination will be Mars. The SLS is a huge, liquid-fuelled rocket. If it is fully developed, it will be the most powerful rocket ever built. Its lift capability will be much bigger than that of the space shuttle of Saturn 5, the rocket that sent the Apollo missions to the moon. NASA is planning to launch its first unmanned test flight in 2017. It is hoped that the first crew will fly in 2021 and astronauts will make it to a nearby asteroid in 2025. NASA hopes to send the rocket and astronauts to Mars from the asteroid by the 2030s, according to the Associated Press (AP). NASA used liquid rockets to send Apollo, Gemini and Mercury into space, but later changed to solid rockets boosters because they were cheaper. Tragically, however, a booster flaw caused the space shuttle Challenger to crash in 1986. The new project plans to return to liquid fuel. According to AP, the rockets will at first be able to carry 77 to 110 tons of payload . Eventually they will be able to carry 143 tons into space, maybe even as many as 165 tons, NASA officials said. By comparison, the Saturn 5 booster could lift 130 tons and the space shuttle just 27 tons. However, unlike reusable shuttles, these powerful rockets are mostly one use only. New ones have to be built for every launch. This will be very costly. NASA estimates that it will cost about $3 billion (19 billion yuan) per year, or $18 billion until the first test flight in 2017. NASA hopes to make money by allowing private companies to send astronauts to the International Space Station like giant taxi services, so that the program can be "sustainable". "This is perhaps the biggest thing for space exploration in decades," said Senator Bill Nelson, a former astronaut. "The goal is to fly humans safely beyond low-Earth orbit and deep into outer space where we cannot only survive, but one day also live." Question: It can be inferred from the passage that _ . - the SLS program is planning to make reusable rockets - the goal of the SLS program is to enable humans to live on the moon - the US government may not have provided enough money for the SLS program - NASA will use SLS as a space taxi between the Earth and Mars
(Answer)
the US government may not have provided enough money for the SLS program

Ques:Read the following article and select the best answer. Article: Researchers who study relationships have discovered that a big difference between those who make new friends easily, and those who don't, is that socially successful people tend to make eye contact with their conversation partners much more frequently than those who are less successful socially. In fact, you may be able to become much more socially successful by making this one simple change to your behavior. Most Americans prefer to have a lot of eye contact when they are talking with someone. When a person doesn't make eye contact with them, they tend to think that the person is hiding something or the person doesn't believe in himself/herself. When you are having a conversation and you want to leave a friendly impression, be sure to keep looking at that person frequently while you are talking. If it really bothers you to look directly into another person's eyes, you can gaze generally at, not above, the eyebrow area or the bridge of the nose; this is close enough to the eye region that you will appear to be looking at the person's eyes. But neither the hair or the shoulders have the same effect. Don't stare at other people too intensely, otherwise, you will look aggressive . Keep the majority of your focus on the other person. If you glance around the room too much, or look too frequently at other people, your conversation partner may guess that you are looking around for someone else you would rather talk with. You can lighten your nervousness by smiling more often, nodding, and by gazing at the entire face as well as the eyes. In addition, you can frequently look away for very short periods. When people get the sense that you are really paying attention to them, they will be much more likely to want to have conversations with you! Question: Which of the following is NOT the impression left by those who don't make eye contact during the talk? - They are not telling the truth. - They are bored with the partner. - They are lacking in confidence - They are angry and ready to attack.

Ans:
They are angry and ready to attack.