2．The underlined expression “left on standby” in the sixth rule means

　　.

　　A. ready to start and use electricity

　　B. ready to be turned off

　　C. ready to be repaired

　　D. ready to be put away

　　答案　A

　　解析　词义推测题。根据划线词所在段“Unplug your PC，TV and VCR. Simply turning them off isn't enough. Sets left on standby are still using 25 percent of their power.”可知，仅仅关上电器的开关是不够的，电器的插头没有拔出仍然会耗电，说明这时电器处于待机状态。故选A项。

　　3．Which of the following will NOT protect trees from being cut down to make paper?

　　A. Not buying newspapers.

　　B. Don't accept junk mail.

　　C. Read your newspaper online.

　　D. Read only one newspaper.

　　答案　D

　　解析　细节理解题。根据第三段的内容，特别是该段最后一句“Either recycle your newspapers or read the news online.”可知，A、B、C三项都是保护树木的做法，因为生产报纸会消耗大量的树木。故选D项。

　　B

　　San Francisco's Chinatown is the biggest and oldest in the country. It's the third most visited tourist destination in the city. It's also the city's most densely populated neighborhood. So why are businesses in Chinatown struggling?

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