专题3.2 Unit 3 Discovering Useful Structures（备作业）-【上好课】2021-2022学年高一英语同步备课系列（人教版2019必修第三册）

必修第三册练习 原创精品资源学科网独家享有版权，侵权必究！6 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 Unit 3 Diverse Cultures Discovering Useful Structures 一、单选题 1．Is this the reason ________ at the meeting for his carelessness in his work? A．he explained B．what he explained C．how he explained D．why he explained. 2．What annoys me is the way ________ he is always showing off his good grades. A．which B．how C．where D．/ 3．While ____ in the street, he came across his old friend. A．to walk B．walking C．walked D．he walk 4．Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking. A．aware B．aware of C．are aware of D．be aware of 5．This is an illness that can result in total blindness if ______. A．to leave untreating B．left untreated C．leaving untreating D．is left untreated 6．Generally speaking, when according to the directions, the medicine has no side effect. A．taken B．taking C．to take D．to be taken 7．Though _