劉同功

來自美國西北大學的一個研究團隊，通過研究借風播散的種子，成功研發(fā)出迄今為止最小的微型飛行器。

1?It?s?raining?microchips.?One?day，?they?could?float?gently?through?the?air?while?gathering?environmental?data，?land?on?the?ground?and?then?disappear?when?their?work?is?done.?That?s?the?future?a?team?of?engineers?sees?for?what?they?re?calling?“microflier”，?a?tiny?winged?microchip?with?designs?inspired?by?nature.

2?The?accomplishment?belongs?to?a?team?of?scientists?at?the?Northwestern?University?in?Illinois，?who?developed?the?microflier，?a?flying?microchip?that?spins?like?a?helicopter.?This?thing?is?the?size?of?a?grain?of?sand?but?with?small?wings?and?an?aerodynamic?（流線型的）?design?that?allows?it?to?fall?in?a?controlled?manner?thanks?to?its?barely?visible?propellers.

3?How?does?that?work？?Well，?the?engineers?used?nature?s?“manual”?to?get?their?inspiration?for?the?microflier，?analyzing?the?behavior?of?various?types?of?wind?spread?seeds.?Instead?of?using?a?motor?or?engine，?the?tiny?flying?microchip?uses?the?power?of?wind?to?catch?a?flight，?spinning?across?the?ground?at?a?low?speed.?It?is?a?stable?flight，?and?the?microflier?can?stand?in?the?air?for?a?long?time，?which?is?why?it?could?prove?to?be?useful?for?a?variety?of?applications.

4?While?nature?has?designed?seeds?with?very?sophisticated?aerodynamics，?the?Northwestern?team?claims?its?microflier?is?better，?as?it?is?even?smaller?and?its?structure?allows?it?to?fall?with?more?stable?paths?and?at?slower?speeds?than?equivalent?（相當?shù)模?seeds?from?plants?or?trees.

5?The?engineers?built?the?flying?structure?to?be?used?for?purposes?such?as?population?surveillance，?pollution?monitoring，?disease?tracking，?to?give?just?a?few?examples.?And?while?this?might?look?like?a?simple，?limited?device?right?now，?researchers?see?its?potential?for?becoming?a?highly?functional?electronic?device.?The?microflier?can?be?equipped?with?really?sophisticated?technology，?such?as?tiny?sensors，?antennas?（天線）?for?wireless?communication，?or?embedded?（嵌入的）?memory?for?data?storage.

Choose?the?best?answers?according?to?the?text

Detail?1.?What?gave?the?scientists?inspiration?for?the?microflier？

A.?Helicopters.?B.?Flying?birds.

C.?Falling?seeds.?D.?Raindrops.

Detail?2.?What?is?the?microflier?powered?by？

A.?Wind.?B.?Electricity.

C.?An?engine.?D.?Solar?energy.

Detail?3.?Which?is?one?advantage?of?the?microflier?over?nature?s?work？

A.?It?produces?less?noise.

B.?It?carries?more?weight.

C.?It?flies?along?designed?paths.

D.?It?can?stay?in?the?air?for?a?long?time.

Gist?????4.?The?last?paragraph?focuses?on?the?microflier?s??????????????????.

A.?working?principle?B.?development?process

C.?potential?market?D.?accomplished?tasks

Analyze?some?difficult?sentences?in?the?text

1.?This?thing?is?the?size?of?a?grain?of?sand?but?with?small?wings?and?an?aerodynamic??design?that?allows?it?to?fall?in?a?controlled?manner?thanks?to?its?barely?visible?propellers.?這種飛行器只有一粒沙子那么大，但是它有微型雙翼和流線型的設計外形。由于它的這種設計和它肉眼難見的螺旋槳，它能夠以一種可控的方式降落。

【點石成金】本句是一個復合句。主句是This?thing?is?the?size?of?a?grain?of?sand?but...design，that引導定語從句，先行詞是design.

2.?It?is?a?stable?flight，?and?the?microflier?can?stand?in?the?air?for?a?long?time，?which?is?why?it?could?prove?to?be?useful?for?a?variety?of?applications.?這種微型飛行器飛行穩(wěn)定，能在空中長時間停留，所以它可能被用于各種用途。

【點石成金】本句是一個復合句，句中and連接兩個并列句;which引導的是一個非限制性定語從句，在這個非限制性定語從句中有一個why引導的表語從句。