2013年12月英语六级选词填空习题及答案2013年12月英语六级选词填空习题及答案.doc

2013年12月英语六级选词填空习题及答案(1) A novel way of making computer memories, using bacteria　FOR half a century, the (1) __________of progress in the computer industry has been to do more with less.　　Moores law famously observes that the number of transistors which can be crammed into a given space (2)__________ every 18 months.　　The amount of data that can be stored has grown at a similar rate.　　Yet as (3)__________ get smaller, making them gets harder and more expensive.　　On May 10th Paul Otellini, the boss of Intel, a big American chipmaker, put the price of a new chip factory at around $10 billion.　　Happily for those that lack Intels resources, there may be a cheaper option—namely to mimic Mother Nature,　　who has been building tiny (4)__________, in the form of living cells and their components, for billions of years, and has thus got rather good at it.　　A paper published in Small, a nanotechnology journal , sets out the latest example of the (5)__________.　　In it, a group of researchers led by Sarah Staniland at the University of Leeds, in Britain, describe using naturally occurring proteins to make arrays of tiny magnets,　　similar to those employed to store information in disk drives.　　The researchers took their (6)__________ from Magnetospirillum magneticum, a bacterium that is sensitive to the Earths magnetic field thanks to the presence within its cells of flecks of magnetite, a form of iron oxide.　　Previous work has isolated the protein that makes these miniature compasses. Using genetic engineering, the team managed to persuade a different bacterium—Escherichia coli, a ubiquitous critter that is a workhorse of biotechnology—to (7)__________ this protein in bulk.　　Next, they imprinted a block of gold with a microscopic chessboard pattern of chemicals.　　Half the squares contained anchoring points for the protein.　　The other half were left untreated as controls.　　They then dipped the gold into a solution containing the protein, allowing it to bind to the treated squares