Read the article and select the best answer. Article: The oldest and most common source of renewable energy known to man, biomass is one of the most important forms energy production in the United States and elsewhere. Since such a wide variety of biomass materials is everywhere --- from trees and grasses to agricultural and city --- life wastes ---biomass promises to play a continuing role in providing power and heat for millions of people around the world. According to the Union of Concerned Scientists(UCS), biomass is a kind of renewable energy source that produces no carbon dioxide , because the energy it contains comes from the sun. When plant matter is burned, it gives off the sun's energy. In this way, biomass serves as a sort of natural battery for storing the sun's energy. As long as biomass is produced continuously ---with only as much grown as is used-- the "battery" lasts forever. According to the Energy Information Administration, biomass has been one of the leading renewable energy sources in the United States for several years running through 2007, making up between 0.5 and 0.9 percent of the nation's total electricity supply. In 2008---although the numbers aren't all in yet---wind power probably took over first place because of the rapid development of wind farms across the country. Producing power from biomass helps reduce some 11 million tons of carbon dioxide each year. Some homeowners also try to make their own heat by using biomass materials. Such practice may save homeowner's money, but it also produces a lot of pollution. So, the best way is to encourage power plants to use it. Question: We learn from the text that in 2008 _ . Options: A: Wind power would be the leader of renewable energy. B: there was a rapid growth of electricity production C: biomass might become the main energy source D: 0.5~0.9 of power supply came from biomass
A

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Read the article and select the best answer. Article: A study found that young people have a stronger and more unpleasant scent than the elderly,while elderly people's smell was the most distinctive,less intense and unpleasant. Researchers said the change in our smell is driven by the chemicals we release through our glands and the bacteria on our skin. To test whether or not it really exists,scientists collected a series of samples from three groups of 12 to 16 donors,aged 20 to 30,45 to 55 and 75 to 95.Volunteers wore special T-shirts fitted with underarm pads as they slept for five nights,after which the pads were cut up and put in glass jars. A separate group of 41 people aged 20 to 30 was then asked to smell two jars at a time and asked which group of the donors was older,as well as rating how strong and unpleasant each smell was. When asked to specify whether a particular sample was from a young,middle aged or old person,they were much more successful at identifying older people. Despite being the most distinctive,the older people's smell was also rated as being obviously less intense and less unpleasant than those from the other groups. Researchers said their findings appeared to contradict people's negative ideas about the old person's smell but admitted other factors,like smelly breath or skin,could be to blame for its bad reputation. "Similar to other animals,humans can give off body scents that allow us to identify biological age,avoid sick individuals and pick a suitable partner. Elderly people have a distinctive scent that younger people consider to be not very unpleasant. This was surprising given the popular conception of old age scent as smelly. However,it's possible that other sources of body scents,such as skin or breath,may have different qualities," said Dr Johan Lundstrom,who led the study. Question: What do we know from the study? Options: A: People of different ages give off different scents. B: People's scent can only be changed by the bacteria on their skin. C: People show great interest in old people's scent. D: People's scent can help distinguish a man and a woman.
(Answer)
A

Read the article and select the best answer. Article: Last week, my granddaughter started kindergarten, and I wished her every success. But part of me didn't. I actually wanted her to fail in some ways because I believe that failure can be good for our learning process. Success is proving that you can do something that you already know you can do, or doing something correctly the first time, which can often be a problematic victory. First-time success is usually a fluke . First-time failure, by contrast, is expected to be the natural order of things. Failure is how we learn. In Africa they describe a good cook as "She who has broken many pots." If you've spent enough time in the kitchen to have broken a lot of pots, probably you know a fair amount about cooking. I once had dinner with a group of cooks, and they spent time comparing knife wounds and burn scars. They knew how much credibility their failures gave them. I earn my living by writing a daily newspaper column. Each week I am aware that one column I write is going to be the worst column. I try my best every day. I have learned to cherish that column. A successful column usually means that I am discussing my familiar topic, writing in a style I am used to or saying the same things as anyone else but in a fancy way. My younger daughter is a trapeze artist. She spent three years putting together a show, and she did it successfully for years. There was no reason for her to change it but she did anyway. She said she was no longer learning anything new and she was bored. And if she was bored, there was no point in subjecting (......) her body to all that stress. She risked failure and great public embarrassment in order to feed her soul. My granddaughter is a perfectionist. She will feel her failures, and I will want to comfort her. But I will also, I hope, remind her of what she learned, and how she can do better next time. I hope I can tell her, though, that it's not the end of the world. Indeed, with luck, it is the beginning. Question: The writer talked about his own experience to show that _ . Options: A: we cannot depend on luck to live a good life B: we should try every possible way to avoid failure C: past failures made him dare not take risks in writing D: the thought of failure will make you work even harder
D