高考英语（北师大版）：第一部分选修7unit 21知能演练轻松闯关含解析.docVIP

Unit21HumanBiology(A卷)

Ⅰ.单句语法填空

1．It’shightimethatwegotdownto____________(deal)withtheproblemoffoodsafety.

答案：dealing

2．Heneedn’thavestoodinaqueue；heshould____________(get)theticketfromthemachine.

答案：havegot

3．Itisunwisetopursueeconomicdevelopment____________thecostoftheenvironment.

答案：at

4．Therearestillmanypeoplesufferingalot，andwearetodosomethingtowipe____________poverty.

答案：out

5．Youcouldanswermostofthequestionsnowifyou____________(review)thelessonslastnight.

答案：hadreviewed

6．Makesurethatalltheplansmust____________(submit)byTuesday.

答案：besubmitted

7．Hetriedtopersuademetogiveupsmoking，but____________vain.

答案：in

8．Theboy，thoughbrought____________inthecountryside，hasastronginterestinthecolorfulcitylife.

答案：up

9．Itisnecessarytoprohibitpeople____________(use)mobilephonesinsomeplaces.

答案：using

10．Pleaseequipyourself____________asharppencilandarubberfortheexam.

答案：with

Ⅱ.阅读理解

(2016·陕西五校联盟高三模拟)Itseemshardtowatchsomeoneyawnandnottoyawnourselves.Evenreadingaboutyawningcanmakeyoudoit.Now，anewstudyhasfoundwhyyawninghassuchapowerfulforce.

Yawningwhenothersyawn，thestudysuggests，isasignofpityandaformofsocialconnection.Kidsdon’tdevelopthisdeeplyrootedbehavioruntilaroundagefour，thestudyfound.Kidswithautism(自闭症)arelesslikelytocatchyawns.Inthemostseriouscases，theyneverdo.Yawningmighthelpdoctorstoseewhetherthechildrenaredevelopingrightly.Theworkcouldalsoleadtoabetterunderstandingofthewaysthatpeoplecommunicateandconnect.

“Emotionalinfectionseemstobeabornthingthatconnectsustogether，”saidMollyHelt，agraduatestudentinpsychologyattheUniversityofConnecticut.“Yawningmaybepartofthat.”Inspirationforherstudycamewhenshetriedtogetherownautisticsontoclearhisearsonanairplane.Sherepeatedlyyawnedathim，hopinghewouldy