单项选择题

Although it is made in America, BigBelly is reminiscent(使人想起) of a futuristic Japanese robot. Flashing lights indicate when it is full and needs to be emptied. Many are wireless. enabled, which effectively turns them into Twitterers—they transmit brief text messages to a centralized Web site to let owners know when compactors are full. Like many smart green products, they’re not cheap—and they’re much more expensive than the dumb product they’re hoping to dislodge. It costs about $ 80 a month to lease(长期租用) a BigBelly, or from $ 3,000 to $ 3,900 to purchase one, though those buying in bulk get a discount.
How can BigBelly let his owner know that the compactor is full

A. By sending text messages to a centralized website.
B. By turning on the flash-lights connected to the compactor.
C. By sending a robot to remind the owner.
D. By sending messages through Twitterers.
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The utilities are more interested in protecting their stranglehold on the power grid and preserving their century-old business model than they are producing clean electricity, says Jim Harvey, who heads up the Joshua Tree, Calif. — based Alliance for Responsible Energy Policy, an advocacy group that’s staunchly opposed to utility-generated solar power. Harvey actually believes that the country’s entire renewable portfolio can be achieved through rooftop solar alone. That may be possible from a sheer megawatts perspective, but from a practical standpoint, it’s way over— ambitious. With no centralized source, how do you run traffic or street lights What if it rains for a week We still don’t have foolproof means to store solar power, so for how, distributed generation needs the grid as a backup. What does the author think of Harvey’s idea of achieving the country’s entire renewable portfolio through rooftop solar alone
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