14. A. important

　　B. new

　　C. else

　　D. extra

　　15. A. next to

　　B. beside

　　C. in front of

　　D. behind

　　16. A. paying

　　B. looking

　　C. asking

　　D. reaching

　　17. A. hands

　　B. pockets

　　C. box

　　D. basket

　　18. A. thrown

　　B. stolen

　　C. buttoned

　　D. hidden

　　19. A. shouted

　　B. smiled

　　C. looked

　　D. laughed

　　20. A. leave

　　B. pay

　　C. speak

　　D. apologize

　　阅读理解

　　A

　　With petroleum reserves (石油储量) decreasing, the search is on to replace gas with a cleaner，greener alternative. Though much ecotalk 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.

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