Reading Comprehension
Directions: Read the following passage. Choose the best answer from the four choices marked A, B, C and D for each question.

     Engineers and scientists are working on several ways to catch the carbon, either before or after coal bums. One technology known as integrated gasification combined cycle，or IGCC，would turn the coal into gas before it’s burned for energy; gasifying it releases the carbon for capture, transportation, and sequestration deep underground. Another process，called “oxy-coal” combustion， removes nitrogen from air before combustion; when coal is burned, the waste gas is close to pure C〇2, which can be easily captured.
     Scientists and engineers hope to pump this captured carbonation through mile-long straws that reach deep into the Earth’s crust, into salt mines，aquifers and oil fields. Underground, the pressure will liquefy it and perhaps eventually turn it to rock. Think of it as “geo-bottling” - except we never want to pop the cap. From Houston to Huainan，scientists are already digging holes and pumping down C〇2 by the ton.
     Today, the C〇2 captured for producing soda is only a very small percentage of the total CO2 from power plants, but the technology for large-scale carbon capture and storage looks to be just around the comer. Spurring action from industry and governments has proved difficult, however, because the long-term economic, social and environmental costs of CO2 pollution are not included in the price we pay for energy. That makes C〇2-intensive sources of energy like coal-fired power plants look like a better deal than cleaner technologies. But the truth is，it’s a “pay me now, or pay me later” situation. In the context of climate change，it’s more like，“pay me now，or your kids will pay me even more later.”
     Fortunately, a combination of efficient markets and smart policy could level the playing field. A. carbon-storage industry will be virtually impossible without a national policy that puts a price on CO2 pollution. One such policy involves the creation of a national cap for greenhouse gas emissions and an accompanying market for tradable carbon emission credits. This summer, the U.S. Senate will likely consider legislation that would set up such a market. By making carbon a pollutant and unleashing market forces to find a price for it, the nation will essentially be revealing fossil fuel’s true social cost - and giving cleaner technologies, including carbon capture and storage, a fair shot.