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.

　　1. The underlined word “yield” in Paragraph 2 can be replaced by ________.

　　A. control

　　B. require

　　C. produce

　　D. grow

　　2. 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

　　3. According to Paragraph 3, one of the advantages of algae fuel is that________.

　　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

　　4. What do we learn about algae from Paragraph 4?

　　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.

　　5. What does the passage mainly talk about?

　　A. Environmental protection.

　　B. Biofuels from corn and soybeans.

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