Unit 6 分层练习-2023-2024学年九年级英语全一册基础知识专项讲练（人教版）

Unit 6 When was it invented？（分层练习） 基础篇 一、单项选择 1．I really don’t want to know the secret. I only found it _________. A．by an accident B．by the way C．by myself D．by accident 2．—May I sit here? —_________. A．Never mind B．My pleasure C．With pleasure D．It’s a pleasure 3．_________ is said that there will be rain tomorrow. A．It B．This C．That D．One 4．Do you know who _______ WeChat? A．discover B．invent C．discovered D．invented 5．—Excuse me, sir, but is this umbrella yours? —Oh, sorry. I just took it _________. Mine is behind the door. A．by chance B．in chance C．in mistake D．by mistake 6．Mum added lots of ______ on the food but it still wasn’t______. A．salt; enough sat B．salt; salty enough C．salty; enough salty D．salt; salt enough 7．Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉）． A．come up with B．look forward to C．talk about D．give up 8．It’s a pity that ________ my father ________ my mother allows me to swim alone. They think it’s dangerous. A．either...or B．neither...nor C．both...and D．not only...but also 9．—Is it necessary for us to turn to our teachers for help when we are in trouble? —I never ________ that our teachers will help us. They are always the people we can depend on. A．realize B．hope C．doubt D．guess 10．It was ________ one o’clock when the man returned home. His wife was still waiting for him. A．nearly B．simply C．really 11．Hangzhou Asian Games ________ in September and in October, 2023. A．took place B．are held C．were taken place D．held 12．—Who do you admire most, Yang Ming? —Zhong Nanshan. All of my classmates ______ him. A．look up B．look after C．look for D．look up to 13．—Thank you for sharing your food with me. —_______ That’s what friends are for. A．It doesn’t matter. B．It takes time. C．Never mind. D．Don’t mention it. 14．—Who do you agree with, Joe or Susan? —Well, it’s hard to say. I think both of them________. A．have a point B．take a risk C．play a role D．make a deal 15．— It’s said that our boss left for Beij