参考答案

正确答案：D
(22)Everyyear，peopleinAmericauseenergyequaltoover30millionbarrelsofoileachday．That"senergyinallforms——off，gas，coal，nuclear，solarandevenwindpower．(23)Viewedfromscientists"standpoint，alltheenergycontainedinfueleithernoworinthefuturebecomesheat．Someoftheheatisuseddirectlyorproducesusefulwork;therestislostorrejected，radiatedintotheatmospherefromtheengines，motors，boilersandalltheotherenergy-consumingmachinerythatmakesAmericans"wheelsgoaround．(25-1)Ifwecouldfigureouthowtoimprovetheefficiencywithwhichweuseenergy，wecandoalotmoreworkwiththeenergythatisavailable．Withmoneyandcarefulplanning，wecanboostefficiencyuptoapoint．Yetimprovementwon"tcomeeasily，itwon"tcomeovernightandtherearelimitsbeyondwhichnotevensciencecantakeus．AccordingtotheCentreforStrategicandInternationalStudies，aboutthreequartersofenergyweusetomovethings，includingourselves，accomplishesnousefulwork．(25-2)Intermsofefficiencyandcleanness，buses，trainsandotherformsofpublicormasstransportationaresuperiortotheprivateautomobile．(24)Butonlyiftheyoperateatnearcapacity，otherwise，theiroverallefficiencyispoor．Forsomepeople，masstransitmightansweralltransportationneeds．Forothers，acombinationofmasstransitandprivatetransportationmaybedesirable．BetterdesignandwiseruseofbothmasstransitsystemsandprivatevehicleswillplayanimportantpartinhelpingAmericagetmoreoutofenergyusedfortransportation．未听先知预览四道题的选项，由选项中的0il，heat，pollution，enviroment-friendly，energy，Feul等词可以推测，短文与能源和环保有关；根据第24题各选项中的When，需要关注短文中提到的时间点；第25题是抽象的名词短语，推测可能会考查文章的中心议题。WhatdoesthespeakersayaboutenergyusedintheUnitedStates?详解四个选项均是以It开头的句子，C、D中均出现了oil，可推测该题可能与石油相关。短文中提到美国人每天使用的能源等于3千多万桶石油，故答案为D)。