题目

Read and write(读一读，用适当的单词填空，每线词数不限)：1.There________a computer in the classroom. There are some________(book), too. 2.Miss Lin and Mr Li________teachers. They're in the teachers'________now. 3.There is a________(铅笔盒)in the bag. There are some________(书)on the desk. 答案：【答案】isbooksareofficepencile-casebooks【解析】1.句意：教室里有一台电脑。也有一些书。a computer 单数名词，因此be动词用is，some“一些”后跟名词复数，故答案为is，books。2.句意：林小姐和李先生是老师。现在他们在教师办公室。主语林小姐和李先生是复数，因此be动词用are， 教师办公室the teachers' office如图，在△ABC中，∠ACB=90°，CD、CE分别是高和角平分线，已知△BEC的面积是15，△CDE的面积为3，则△ABC的面积为（ ）A．22.5或20B．22.5C．24或20D．20