Unit7测试(限时：60分钟满分：100分)一、单项选择(每小题1.5分，共15分)1.—Youshouldbebravewhenyouare________thefaceofdifficulty.—Iagreewithyou.A.withB.inC.fromD.through2.Peopleshouldknowthe________ofprotectingtheenvironment.Weshouldtakeactiontosaveourearth.A.conditionB.forceC.tourD.importance3.—Howheavyisanelephant？—It________about5，000kilos.A.includesB.weighsC.eatsD.loses4.—Chinaisover5000yearsold.It'soneof________countriesintheworld...