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
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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.
单项选择题
Whatever the world’s governments decide to do about climate change, one thing seems certain: the value of carbon is going to rise. Government and industry are beginning to invest in technologies to capture carbon from their smokestacks (大烟囱),and entrepreneurs are beginning to figure out ways to recycle it. One of them is Carbon Sciences, a Santa Barbara, California, firm that says it has found an efficient way of turning carbon dioxide and water into methanol, a type of fuel that racing cars now use instead of gasoline. (Although the fuel would produce carbon when it’s burned, its net effect would be neutral, says the company, because carbon was used in producing it.) What is methanol according to the passage
A. It is a kind of waste that cars emit.
B. It is a kind of naturally-produced fuel.
C. It is a kind of fuel that racing cars use.
D. It is a kind of fuel from smokestacks.
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