阅读下面的短文，文中有l5处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择l个最佳答案，涂在答题卡相应的位置上。

　　51、根据材料，回答{TSE}问题。

　　Less Is Mere

　　It sounds all wrong -- drilling holes in a piece of wood to make it more resistant to knocks.But it works because the energy from the blow gets distributed throughout the wood rather thanfocusing on one weak spot. The discovery should lead to more effective and lighter packagingmaterials. Carpenters have known (51) __________ centuries that some woods are tougher than others. Hickory (山核桃木), for example, was turned into axe handles and cartwheel spokes(轮辐) because it can absorb shocks without breaking. White oak, for example, is muchmore easily damaged, (52)__________ it is almost as dense. Julian Vincent at Bathe University and his team were convinced the wood's internal structure could explain the differences.

　　Many trees have tubular (管状的) vessels that run (53)__________ the trunk and carry waterto the leaves. In oak they are large, and arranged in narrow bands, but in hickory they aresmaller, and more evenly distributed. The researchers (54)__________ this layout might distribute ablow's energy throughout the wood. soaking up a bigger hit. To test the idea, they drilledholes 0.65 millimetres across into a block of spruce (云杉), a wood with (55)__________ vessels,and found that (56)__________withstood a harder knock. (57)__________when there were more thanabout 30 holes per square centimetre did the wood's performance drop off.

　　A uniform substance doesn't cope well with knocks because only a small proportion of thematerial is actually(58) __________All the energy from the blow goes towards breaking thematerial in one or two places, but often the pieces left(59)__________ are pristine ( 未经破坏的).But instead of the energy being concentrated in one place, the holes provide many weakspots that all absorb energy as they break, says Vincent. "You are controlling the places(60) __________the wood breaks, and it can then absorb more (61)__________, more safely. " Theresearchers believe the principle could be applied to any material -- (62)__________ example, tomanufacture lighter and more protective packaging. It could (63) be used in Carbumpers, crash barriers and armour for military vehicles, says Ulrike Wegst, a (64)__________ atthe Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you(65) to design the substance with the direction of force in mind. "The direction ofloading is crucial," she says.

　　请在第__(51)__处填上正确答案

　　A.in

　　B.since

　　C.for

　　D.at

　　52、请在第__(52)__处填上正确答案

　　A.or

　　B.although

　　C.and

　　D.despite

　　53、请在第__(53)__处填上正确答案

　　A.down

　　B.over

　　C.up

　　D.into

　　54、请在第__(54)__处填上正确答案

　　A.knew

　　B.concluded

　　C.saw

　　D.thought

　　55、请在第__(55)__处填上正确答案

　　A.no

　　B.per

　　C.each

　　D.every

　　56、请在第__(56)__处填上正确答案

　　A.it

　　B.the idea

　　C.they

　　D.spruce

　　57、请在第__(57)__处填上正确答案

　　A.I

　　B.Just

　　C.Only

　　D.Rarely

　　58、请在第__(58)__处填上正确答案

　　A.knocked

　　B.beaten

　　C.slapped

　　D.affected

　　59、请在第__(59)__处填上正确答案

　　A.behind

　　B.beyond

　　C.for

　　D.in

　　60、请在第__(60)__处填上正确答案

　　A.which

　　B.there

　　C.that

　　D.where

　　61、请在第__(61)__处填上正确答案

　　A.water

　　B.air

　　C.energy

　　D.safety

　　62、请在第__(62)__处填上正确答案

　　A.among

　　B.in

　　C.as

　　D.for

　　63、请在第__(63)__处填上正确答案

　　A.also

　　B.besides

　　C.else

　　D.yet

　　64、请在第__(64)__处填上正确答案

　　A.psychologist

　　B.physicist

　　C.biologist

　　D.pianist

　　65、请在第__(65)__处填上正确答案

　　A.have

　　B.must

　　C.should

　　D.had