C. risen D. decreased
答案:A 词义推测题。这句话要表述的意思是“中国的网民已经上升到了1亿,仅次于美国,在全世界排名第二”,故答案为A项。
B
The rate at which the United States is becoming more energy efficient has risen since 1995, when the computer based Internet and communications revolution began soaking into (渗入) US society. That conclusion from a creative study by the American Council for an EnergyEfficient Economy (ACEEE) last week stands in sharp contrast to recent concerns that the computer based Internet was gobbling up (吞噬) huge amounts of energy.
Indeed, all America's servers—the computers that direct traffic on the Internet and the systems that cool them use about 1.2 percent of the nation's electricity, according to a study last year. That's still a lot of power, comparable to the energy used by color TVs in the US. But it turns out that for every kilowatthour of electricity used by information and communications technologies, the US saves at least 10 times that amount, the new ACEEE report found.
After the oil embargoes (禁运) from the 1970s, America quickly became more efficient and its “energy intensity” fell sharply. Energy intensity is the amount of energy required to produce a dollar of economic output. Since 2001, the pace of US energy efficiency gains has remained remarkably high, at 2. 4 percent annually, at least half due to technology gains, researchers say.
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