单选题My little brother practices the speech repeatedly until his Udelivery /Uand timing were perfect.

单选题If you ______ your influence, they may change their decision. A. compel B. exert C. expose D. vary

单选题 Priscilla Ouchida's "energy-efficient" house turned out to be a horrible dream. When she and her engineer husband married a few years ago, they built a $ 100, 000, three-bedroom home in California Tightly sealed to prevent air leaks, the house was equipped with small double-paned(双层玻璃的) windows and several other energy-saving features. Problems began as soon as the couple moved in, however. Priscilla's eyes burned. Her throat was constantly dry. She suffered from headaches and could hardly sleep. It was as though she had suddenly developed a strange illness. Experts finally traced the cause of her illness. The level of formaldehyde(甲醛) gas in her kitchen was twice the maximum allowed by federal standards for chemical workers. The source of the gas? Her new kitchen cabinets and wail-to-wall carpeting. The Ouchidas are victims of indoor air pollution, which is not given sufficient attention partly because of the nation's drive to save energy. The problem itself isn't new. "The indoor environment was dirty long before energy conservation came along," says Moschandreas, a pollution scientist at Geomet Technologies in Maryland. "Energy conservation has tended to accentuate the situation in some cases." The problem appears to be more troublesome in newly constructed homes rather than old ones. Back in the days when energy was cheap, home builders didn't worry much about unsealed cracks. Because of such leaks, the air in an average home was replaced by fresh outdoor air about once an hour. As a result, the pollutants generated in most households seldom built up to dangerous levels.

单选题Who is the speaker?

单选题City officials am considering building a path to give the public ______ to the site.

单选题Is it proper for the government to ______ public opinion through self-serving, one-sided journalism? A. touch B. hunt C. sway D. proceed

单选题According to a growing number of experts, it is already technically_____to construct a pioneering space colony, powered by solar energy.

单选题What is it that the author wants to ______ to his readers through the story?

单选题I come into ______with all kinds of people in my work.

单选题Sally Kemmerer has, so far, escaped Northern California's rolling blackouts. But up on the roof for her Oakland home, workers are tapping into, perhaps, the most reliable power source, the sun. It could mean no more worries about blackouts or power rates. Sally Kemmerer, homeowner says, "I hope that we'll be able to zero out, you know, our electric bill. I mean that's definitely our goal." Turning the sun's rays into electricity is, of course, nothing new. But California's power crisis has cast a new light on the technology. Gary Gerber, a solar power contractor, says, "I might have been getting, say three phone calls a week a couple of months age. I'm getting six a day now, it's completely crazy." Alternative energy is even more attractive, thanks to a state rebate program. So far this month, California's energy commission has received 200 project applications. That is more than the number of applications all last year. Putting in a solar roof is still a relatively expensive proposition. This project cost around 45000 dollars. Even taking into account the state subsidy of 12000 dollars, that leaves a net cost to the homeowner of around 33000 dollars. Sally says, "We were happy to find out that, eventually, the system should pay for itself, you know 20-years, maybe." Aaron Wellendorf has had a p-v (or photovoltaic generator) for more than a year. Like most solar systems, his is not off the grid completely the utility still kicks in at night, or when there's no sun. But when there is bright light, things change. Wellendorf says, "I'm turning my meter backward with extra power that I'm generating." Backward? That's right! Wellendorf's meter tracks how much power goes back into the utility grid. Last year all the paid for electricity was a service charge. That charge was around five dollars a month. In fact, even after powering his super-efficient household appliances and his converted electric truck, Wellendorf generated a net surplus of more than 2000-kilowatt hours. Unfortunately, state law doesn't require the utility to pay him for that. Wellendorf says, "I don't get it in money, I just get the satisfaction of helping out the power grid." And, he gets the satisfaction of being energy self-sufficient.

单选题Small animals are said to live faster than big ones because they ______.

单选题The jet quickly ______ into the sky and soon went out of our view. A. ascended B. launched C. assessed D. descended

单选题My work with leaders from all walks of life has ______ me that they were not born leaders—they are made. A. advocated B. implied C. convinced D. illustrated

单选题After lunch I felt ______ enough to ask my boss for a rise in my weekly wages.

单选题After the governor's third trip to overseas, voters complained that he was paying too little attention to ______ affairs. A. intellectual B. foreign C. professional D. domestic

单选题Every second in the United States alone, more then 250 animals are slaughtered for food, adding up to more than 8 billion animals each year. Reducing the amount of meat in one's diet is nutritionally, environmentally, and ethically beneficial. People who eat meat usually have weaker immune systems compared to those of vegetarians. Meat has been directly linked to diabetes, obesity, arthritis, and many other illnesses. Furthermore, meat-eaters are at a higher risk for diseases, including cancer, and they are more likely to die from these diseases. Critics say that a meatless diet does not provide enough nutrients, especially protein end iron. Actually, according to A Teen's Guide to Going Vegetarian, by Judy Krizmanic, protein is found in almost every food, and iron appears in many vegetables. Getting enough nutrients in a meat-reduced diet should not be difficult. A 1988 study found that some of the highest pesticide residues appear in meat and eggs. Diets including more fruits and vegetables will only make people healthier. Some skeptics believe that there will be a shortage of food if animals are not eaten. In fact, the opposite is true. More than 80% of the com and 95% of the oats grown in the U.S. are fed to livestock. The world's cattle alone consume enough food to equal the caloric needs of 8.7 billion people, more than the entire human population. One half of the water used in the Unites States also goes to livestock; 250 gallons of water produces only 11b. (=pound) of beef. If people eat less meat and more plants, the amount of available food will increase. Many people become vegetarians because they feel that eating animals is unethical. 90% of these animals are raised in confinement. Chickens and other birds have only about half a square foot of space each, and since they are raised so close together, a hot blade is used to cut off their beaks to prevent them from pecking each other to death. Likewise, pigs that are repressed will bite each other's tails, so both their teeth and tails are removed as soon as they are born. Eating animals is hazardous in numerous ways. Even a slight reduction in meat intake is better than nothing at all. Consuming less meat is beneficial to the health of animals, the health of people, and the health of the world.