题目内容

Take _ half and give __ half to your sister

A.
neither; either
B.
either; another
C.
either; the other
D.
any; the other

C
考查代词。Neither两者都不；either任何一个；the other两个中的另一个；another多个中的另一个，any任何一个。句意：你（拿两个中的任何）一半，把另一半给你的妹妹。故选C。

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—Which share is meant for me?

—You can take ________ half. They’re exactly the same.

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C. each D. either

They are_______the same size.You can take_______half of the bread.

A.of；either B.with；either C.in；both D.at；none

With petroleum reserves (石油储量) 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(藻类)．

Algae, like corn, soybeans, and other crops, grow via photosynthesis(光合作用) and can be processed into fuel oil. However, they yield 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(柴油) 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 than 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 (烟囱排放物) 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.

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A. control B. require

C. produce D. grow

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A. may pollute water and soil

B. can grow in poor conditions

C. provide much less energy

D. need more special care

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A. it can be used more widely

B. it is more easy to produce

C. it needs much less land

D. it costs much less money

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A. Algae help protect the environment.

B. People can grow algae anywhere.

C. Fish can get more oxygen from algae.

D. Algae produce less waste.

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C. The false hope of biofuels.

D. A promising oil alternative.

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B．either

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Take ___ half and give ____ half to your sister

试题分类

Take _ half and give __ half to your sister