单项选择题

Mint. com has benefited from a cultural shift as well as a tectmological one. During the free-spending housing bubble, a Web site that encouraged people to manage spending, comparison, shop, and save was definitely out of step with the prevailing mood. But once the financial and housing markets tanked and the nation" went into recession, the zeitgeist (时代精神) shifted. Shrinking top lines have caused people to focus on the bottom line, and the savings rate has spiked. Third homes and luxury goods are out; coupons (优惠券) and growing your own vegetables are in. Saving is the new borrowing. Thus considered, Mint. corn, which launched in September 2007, timed the market perfectly. It hit the Web at a time when more Americans suddenly had the time, inclination, and motivation to manage their financial affairs more prudently. And it gave them a way to do it without having to spend a dime.
What is the main reason that mint. com is successful

A. it offers free service.
B. It came into the market at a perfect time.
C. It meets people’s expectations of websites.
D. It catered to people’s interest in planting vegetables.
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单项选择题
In Western Europe or the US, you only have to turn on the tap and you’ll see a jet of cold water, ready to drink, cook and bathe in. or wash the car. Turn on the tap in Karachi and you’ll be lucky to fill a few buckets. Until 1947, the city was part of British India, whose engineers built and maintained a modest water supply network for the city’s 500,000 inhabitants. Today, Karachi is home to around 12 million people. Half of them live in slum townships ,with little or no water through the mains. Even the rich half usually have to wait days before anything trickles through their pipes. And the coloured liquid that finally emerges is usually too contaminated to drink, There are about ______ people living in Karachi slum townships.
A. 500,000
B. 12,000,000
C. 250,000
D. 6,000,000
单项选择题
Sleep also seems to be the time when the brain’s two memory systems—the hippocampus(海马体) and the neocortex (新皮质)— talk with one other. Experiences that become memories are laid down first in the hippocampus, eliminating whatever is underneath. If a memory is to be retained, it must be shipped from the hippocampus to a place where it will endure—the neocortex, the wrinkled outer layer of the brain where higher thinking takes place. Unlike the hippocampus, the neocortex is a master at weaving the old with the new. And partly because it keeps incoming information at bay, sleep is the best time for the undistracted hippocampus to shuttle memories to the neocortex, and for the neocortex to link them to related memories. How can a piece of information become enduring memory in the brain
A. It must first go to the hippocampus for processing.
B. It must be transferred to the neocoretex.
C. It must eliminate the memory underneath it.
D. It must be captured during the time of sleep.
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