英语八上 第22期周报 答案

14.【答案】a>4【解析】由题意得,命题“有在x∈R,使axa+1≤0”的否定“对任意x∈R,使ax2x+1>0为真命题即ax2-x+1>0在R上恒成立而当a=0时,-x+1>0不恒成立,所以/a>0解得a>4=1-4a<0

书面表达One possible versionDear JackI am glad to hear that you will come to our school as an exchange student next year. Since you want toknow about my school, i am writing to introduce some details to you.My school lies in the southeast of our city with convenient transportation, so it will be easy for you to comefrom the airport. The school, where various flowers and fruit trees can be found, provides a pleasantenvironment for students to study in. My school has three grades and almost 1, 000 students altogether andnearly two-thirds of graduates are admitted to key universities every year. Above all, they are friendly andhelpful. Therefore, if you have any difficulty adjusting to your future life, everyone, including me, will give youa handLooking forward to your coming.YoursLi hi

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