54. What can we learn about full-sun coffee production from Paragraph 4?

　　A. It limits the spread of new growing techniques.

　　B. It leads to air pollution and global warming.

　　C. It slows down the loss of shade trees.

　　D. It improves local soil conditions.

　　55. The purpose of the text is to .

　　A. entertain

　　B. advertise

　　C. instruct

　　D. persuade

　　56. Where does this text probably come from ?

　　A. An agricultural magazine.

　　B. A medical journal.

　　C. An engineering textbook.

　　D. A tourist guide.

　　57.Which of the following shows the structure of the whole text?

　　7.【2015·四川】D

　　Their cheery song brightens many a winter's day. But robins are in danger of wearing themselves out by singing too much. Robins are singing all night一as well as during the day, British-based researchers say.

　　David Dominoni, of Glasgow University, said that light from street lamps, takeaway signs and homes is affecting the birds' biological clocks, leading to them being wide awake when they should be asleep.

　　Dr Dominoni, who is putting cameras inside nesting boxes to track sleeping patterns, said lack of sleep could put the birds’ health at risk. His study shows that when robins are exposed to light at night in the lab, it leads to some genes being active at the wrong time of day. And the more birds are exposed to light, the more active they are at night.

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