参考答案

正确答案：C
(20)WhenMattySallinwasworkingonadegreeinartandtechnologyatuniversity，hegotaninterestingassignmentinelectronicsclass:Createsomethingforthehousehold．Hedecidedtocreateanalarmclock．"Everybodyhastouseanalarmclockofsomekindeveryday，andit"sextremelyunpleasant!"hesays．(21)Heaskeddifferentpeoplewhatthey"dliketowakeuptoinsteadofanoisyalarm．Alotofthemsaid，"Thesmellofbacon．"(22)SoSallininventedanewkindofalarmclock:awoodenboxwithapigfaceandadigitalclockthatusesthesmellofcookingbaconratherthansoundtowakesomeoneup．Heexplains，"There"snodangerofburning，becauseIbuiltitcarefully．Ituseslightbulbsinsteadofaflameforcookingandturnsoffautomaticallyaftertenminutes．"Justafeweasystepsarerequiredtosetthe"alarm"．"Whatyoudoisputinacoupleoffrozenstripsthenightbefore，"saysSallin．Baconispreserved，sothereisnodangerofitsspoilingovernight．"Ifyousetthealarmfor8:00，itwillturnonat7:50andslowcookfortenminutesunderthebulbs，"hesays．Thenthebulbsturnoffandafanblowsthesmelloutthroughthenoseofthepig．"Soinsteadofanalarm，yousmellyourselfawake，"saysSallin．"Thenyoucanopenthedooronthesideandpullthebaconoutandeatit．"未听先知预览三道题各选项，由选项中出现的designs，clocks，alarmclock，pigface，automaticmechanism和manufacturingprocess等词，可以推测短文的内容与某种闹钟的创新设计相关．WhatwasMattySallindoingwhenhecreatedanalarmclock?C．详解短文一开始就说，马蒂·赛尔林在大学攻读艺术和技术学位时，曾有一项有趣的任务是发明家用器具，因此，他决定发明一个闹钟．由此可知，他当时还在读大学，故答案为C．