Question: Scientists recently found three animal species living two miles below the surface of the Mediterranean Sea, where the super-salty waters don't have oxygen . They're multicellular , which means their bodies have many cells. They each are as small as a large grain of sand. But they are animals. The most exciting thing about these creatures, say the scientists, is that they obviously don't need oxygen to live. What biologists know about life so far is that only single-celled living things can live in places that have no oxygen, and that multicellular organisms can visit these places, but not live there. These newly found creatures could _ . Finding animals down there was so surprising that the scientists couldn't believe it. At first, "we thought they were dead bodies," Roberto Danovaro, a scientist at the Polytechnic University of Marche in Ancona, Italy, told Science News. To find out whether the animals could actually live there Danovaro and his colleagues brought up more samples from the ocean floor. Studying the animals in the new samples showed that they appeared to be alive. The researchers did more tests, and found that some of the animals had eggs--which suggests they were reproducing . Also in the samples were old skins, suggesting that the animals had lived there long enough to grow. Finally, pictures taken showed that the insides of the animals appear to be adapted to live in an environment that has no oxygen. These clues suggest the animals don't need oxygen, but the evidence is indirect, which means that scientists still have not observed how the animals live without oxygen. This means more studies are needed, but the scientists think they're on the right track. And if they're right, biologists will need to rethink what they know about where animals live. What excited the scientists most is that _ . A) they found three animal species visit the salty water under the Mediterranean Sea B) single-celled animals can live in super-salty waters C) the tiny animals have many cells D) three kinds of animals can live in places that have no oxygen
Answer: D

Question: Below is a selection from a popular science book. If blood is red, why are veins blue? Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison. Which works harder, your heart or your brain? This question depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it. Do old people shrink as they age? Yes and no. Many people do get shorter as they age. But, when they do, it isn't because they're shrinking all over. They simply lose height as their spine becomes shorter and more curved due to disuse and the effects of gravity . Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again?No, because old people don't really shrink!It is not that they are growing backwards--their legs, arms and backbones getting shorter. When they do get shorter, it's because the spine has shortened a little. Or, more often, become more bent and curved. Why does spinning make you dizzy ? Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity and motion sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning , the system goes out... What is the main purpose of the selection? A) To give advice on how to stay healthy. B) To provide information about our body. C) To challenge new findings in medical research. D) To report the latest discoveries in medical science.
Answer: B

Question: International experts meeting in Australia say global carbon emissions can be reduced by more than 50 percent through simple energy saving measures. People at a conference in Australia, which increasingly relies on coal for power, say that reducing power consumption is an affordable way to both cut energy costs and reduce pollution. While many nations turn to cheap and dirty energy sources, such as coal, to meet their increasing energy needs, analysts in Australia say the best way to meet those needs is to improve energy efficiency. A range of simple solutions include using energy-efficient homes, household appliances and lighting, and driving electric cars. Encouraging homeowners and office workers to switch off their televisions and computers at the end of the day is also seen as an effective way to save electricity. Grayson Heffner, from the Paris-based International Energy Agency, says reducing consumption could greatly cut global carbon emissions. He calls efficiency strategies the "soft giant" of clean energy. "We forecast that energy efficiency will deliver something like three-quarters of the greenhouse gas emissions reductions over the next 20 years. So in the short term energy efficiency is the main way that we reduce greenhouse gas emissions but oftentimes it is not so importantly stressed in the discussions," said Heffner. Energy experts working in China say the government is making significant cuts in power usage. Wan Xingwang, a Beijing-based representative of the Energy Foundation, a U.S. non-government organization, says the results have been impressive. "In the past five years China achieved about 19.1 percent of energy reduction of its GDP. That translates to something like more than 600 million tons of coal savings," said Wan Xingwang. While most nations have some sort of government-sponsored energy efficiency programs, energy analysts say initiatives by individuals and companies can also help cut demand. Steven Nadel, executive director of the American Council for an Energy Efficient... What can we learn from what Grayson Heffner said? A) 75% of the greenhouse gas emissions can easily be cut in the next 20 years. B) Ways to reduce greenhouse gas emissions should be discussed. C) Using clean energy is the strategy to cut global carbon emissions. D) The key to reducing greenhouse gases in the short term is to improve energy efficiency.
Answer:
D