With petroleum reserves decreasing,the search is on to replace gas with a cleaner,greener alternative.Though much eco-talk has centered on biofuels from corn and soybeans,the biofuel that looks more likely to replace petroleum comes from a most unlikely source:algae . Algae,like corn,soybeans,and other crops,grow via photosynthesis and can be processed into fuel oil.However,they _ 30 times more energy than land crops such as soybeans,according to the U.S.Department of Energy.Many algae species also can grow in saltwater and polluted water-while corn and soy require arable land and fresh water that will be in short supply as the world's population balloons. "If you replaced all the diesel in the U.S.with soy biodiesel,it would take half the land mass of the U.S.to grow those soybeans,"says Matt Caspari,chief executive of Aurora Biofuels,a Berkeley,Calif.-based private firm that specializes in algae oil technology.On the other hand,the Energy Department says that if algae fuel replaced all the petroleum fuel in the United States,it would require 15,000 square miles,which is a few thousand miles larger that Maryland (12,407 square miles),the 42nd state in land area. Another bonus:Because algae can be grown just about anywhere in a closed space,they 're being tested at several power plants across the nation as a carbon absorber.Smokestack emissions can be pumped directly into the ponds,feeding the algae while keeping greenhouse gases out of the atmosphere. Although processing technology for algae fuel--also known as "oilgae" in some environmentalist circles--is improving,it's still years away from reaching your local gas pump."It's just a question of cost,because no large-scale facilities have been built yet," Caspari says. Compared with corn and soybeans,algae _ . A) may pollute water and soil B) can grow in poor conditions C) provide much less energy D) need more special care
B
A Guide To use or protect all kinds of facilities in the library, follow the procedures given at the circulation desk. Group Study Rooms(2F) Students and teaching staff can use these rooms for group study. Students are advised to use unlocked rooms(4 rooms for 2 people, 3 rooms for 4 people) available for free. When you use locked rooms(2 rooms for 4 people, 2 rooms for 10 people), you need to go through reservation procedures at the circulation desk. These rooms are available for group discussion. Individual Reading Rooms(1-3F) There are 4 single rooms available for use by teaching staff and visiting scholars. Each room is equipped with a computer together 1 printer and 6 scanners. Reservation of these rooms is available for a period up to seven days on end. Meeting Rooms and Seminar Rooms(1-3F) Only teaching staff and graduate students can apply to use these rooms and reserve them one day in advance. The total number of seats is 40. They are available for workshops and small seminars. Computer Rooms(4F) These rooms are available for classes or seminars and so on. The total number of seats is 88. Only teaching staff can apply to use the computer rooms and reserve them one day in advance. Who can apply to use the computer rooms? A) Visiting scholars B) Teachers C) Graduate students D) Teachers and students
B
Q: The first ting we do is to put an APB and this goes to all the police stations in the country. Next we telephone the hospitals. Often the person we are looking for has been in an accident. Then we might try parents, friends or relatives they might be with. We try to follow their movements and to find the last person they saw in local or national papers--especially papers they might read. There are other things we can do: put posters in places where they might be, go on television. Here in America there is a magazine in which there are photographs of missing children. This is often the last hope. Of course, with nearly two million missing children every year, we can't do all these things for everyone. We haven't got the time, or the money , or the people who work for it. When a person is reported to be missing, they A) might not know the exact reason B) might find out the reason first C) set out to look for him at once D) first turn to the police for help
A: D
Q: Bob Butler lost his legs in a 1965 landmine explosion in Vietnam. He returned home as a war hero. Twenty years later,he proved once again that heroism comes from the heart. Butler was working in his garage in a small town in Arizona on a hot summer day when he heard a woman's screams coming from a nearby house. He rolled his wheelchair toward the house,but the dense bush wouldn't allow him to approach the back door. So he got out of his chair and crawled through the dirt and bushes. "I had to get there,"he says. "It didn't matter how much it hurt." When Butler arrived at the house,he traced the screams to the pool,where a three year old girl,Stephanie,was lying at the bottom. She had been born without arms and had fallen in the water and couldn't swim. Her mother stood over her baby screaming loudly. Butler dove to the bottom of the pool and brought little Stephanie up to the deck. Her face was blue,she had no pulse and she was not breathing. Butler immediately went to work performing CPR to revive her while Stephanie's mother telephoned the fire department. She was told the rescue team was already out on a call .Helplessly,she sobbed and hugged Butler's shoulders. As Butler continued with his CPR,he calmly reassured Stephanie's mother. "Don't worry,"he said. "I was her arms to get out of the pool. It'll be okay. I'm now her lungs. Together we can make it." Seconds later the little girl coughed,regained consciousness and began to cry. As they hugged and rejoiced together,the mother asked Butler how he knew it would be okay. "When my legs were blown off in the war,I was all alone in a field,"he told her." No one was there to help except a little Vietnamese girl. As she struggled to drag me into her village,she whispered in broken English,'It okay. You can live. I be your legs. Together we make it.'" "This was my chance,"he told Stephanie's mom,"to return the favor." Why was Butler so confident that the little girl would revive? _ . A) Because he had once experienced the same scene in Vietnam. B) Because he had saved many children in dangerous situation C) Because he remembered the Vietnamese girl's words all time long. D) Because he knew some knowledge of first aid and medical care.
A: C