2021-2022牛津版七年级上英语周报答案

度= absin C18.(1)证明:因为an=n-3,则am+=m+n-3,am=m-3,an=n-3,则am+an=m+n-6,所以am+>a一=n+-一3,则n+p=3-”+3p,而户为正整数,则an>a,故存在正整数p,使得an+,>a,对于任n∈N·都成立(2)解:数列{an}同时满足性质①和性质②理由如下:由an=-2,得an<0,且a-1=5an>a,所以p=1,使得a+p>an对于任意的n∈N都成立所以数列{an}满足性质②由an+1>an,得数列{an}为递增数列又因为an<0,所以对于任意的m,n∈N,am+n>am>an+an分即数列{an}满足性质①

第二节读后续写( One possible version)Fliss immediately took the purse to the local police station with Molly. When they arrivedFliss tied Molly to a fireplug outside and went in herself. She handed the purse to a police officerand explained everything. Greatly touched, he shook her hand and thanked her for doing her duty,promising that he would do his best to find the owner Fliss felt reassured and went back withMolly. The next day, a journalist called to make an appointment for an interview.When the journalist came, they two were on the beach. The journalist was surprised to findthat Molly was picking up litter, following her master. Fliss told the journalist it was on the wayto collecting litter that Molly had found the purse. Hearing this, Molly stopped, wagging her tailas if she understood the whole situation. Having learned about the whole story, the journalist gotto know what they did to protect the local beach. Surprised and impressed, the journalist tooksome pictures. The next day they were on the front page of the newspaper. A minor action couldmake wonders!(162 words)

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