英语周报 七年级上册2022-2022答案

书面表达One possible versionI求Dear PeterI heve good news for you Our school Food Club will hold a dumpling- making activity. As you're interestedin Chinese food, I'm writing to invite you to join in the activity with me.As a kind of traditional Chinese food, dumplings are very popular during festivals, especially in the SpringFestival, when people will get together to make dumplings. The activity will begin at g am next Saturday in theschool canteen. First, (chefs) will teach us how to make dumplings step by step. Then, there will be a dumplingmaking competition in groups. Finally comes the most exciting part--enyoying our dumplings.Looking forward to your coming.Your

1.答案:B解析:根据题意知11+e-111f(x)∵g(1)=[f(1)1+e2g(-1)=[f(-1)]=+12∴g(1)≠g(-1),g(1)≠-g(-1),所以,函数y=g(x)既不是奇函数也不是偶函数,不关于纵轴对称,①错误;函数y=f(x)的定义域为R,f(-x)1+ef(x),所以,函数y=f(x)是奇函数,②正确;任取x1>x2,f(x1)-f(x2)1+e21+e1(1+ex1)(1+e2)则所以,函数f(x)=2-1+。在R上是增函数,③正确;e2>0,;1+e>1,∴0<1+则11即-。

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