B.until
C.before
D.when
19.A.notice
B.settle
C.debate
D.mention
20.A.refused
B.continued
C.pretended
D.hesitated
——————————————————————————————————————
Ⅲ.任务型阅读
China’s Tianhe-1 has a computing speed of 2,507 trillion (万亿) calculations a second,which makes it the fastest computer in the world.It is also 40 percent faster than the world’s second fastest supercomputer,Cray XT5 Jaguar,in the US,kept at a national laboratory in Tennessee,according to the New York Times.Jack Dongarra,a University of Tennessee computer scientist,told NYT that the Chinese supercomputer is faster than the existing Number One machine.
Building the fastest supercomputer has become a source of national pride,as these machines are valued for their ability to solve problems in areas like defense,energy and science.These problems are related to national interests.Supercomputing technology is also found in business.Oil and gas companies use supercomputers to find oil and gas.
Obviously,research centers with large supercomputers attract top scientific talents.This adds extra importance to the machines-they’re more than just huge computers.
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