21．The percentage of American companies that are in favor of keeping office pets is

　　.

　　A．73% B．27% C．25% D．15%

　　．We know from the text that “BJ”

　　A．works in the Global Hair Salon

　　B．often greets the passers-by

　　C．likes to sleep in the sun

　　D．is a two-year-old cat

　　．The best title for this text would be

　　.

　　A．Pets Help Attract Customers B．Your Favorite Office Pets

　　C．Pets Join the Workforce D．Busy Life for Pets

　　Wilderness

　　“In wilderness(荒野) is the preservation of the world.” This is a famous saying from a writer regarded as one of the fathers of environmentalism. The frequency with which it is borrowed mirrors a heated debate on environmental protection: whether to place wilderness at the heart of what is to be preserved.

　　As John Sauven of Greenpeace UK points out, there is a strong appeal in images of the wild, the untouched; more than anything else, they speak of the nature that many people value most dearly. The urge to leave the subject of such images untouched is strong, and the danger exploitation(开发) brings to such landscapes(景观) is real. Some of these wildernesses also perform functions that humans need—the rain forests, for example, store carbon in vast quantities. To Mr.Sauven, these ”ecosystem services” far outweigh the gains from exploitation.

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