2020-2022英语周报答案

【语篇导读】本篇为说明文,介绍了适合高中生的志愿组织和活动。主题语境:人与社会—社会服务与人际沟通21.A考査细节理解。【解析】根据原文 Humane Societ! y of the us部分¨ As a volunteer, you could walkdogs and do the cleaning at a shelter, or even help out at one of its clinics. "a] E, Humane Society ofthe us适合喜爱动物的志愿者。故答案选A。22.D考查细节理解。【解析】根据原文 National park service部分“ Whether you' re working in the visitorcenter or monitoring wildlife in the area, you ll learn a lot about the preservation of nature. " n]*l, ix项目可以让志愿者亲近自然。故答案选D。23.C考査细节理解。【解析】根据原文 Habitat for Humanity部分“ Habitat for Humanity helps lowincome individuals and families build or improve their homes. "L K Goodwill Industries International apb]"This organization is devoted to providing employment, education, and skill-building opportunitiesfor people around the world.”可知,两个项目都可以帮助有需要的人。故答案选C。

21.(本小题满分12分)(1)f()=轴mx-元xf(x)=c0x-5=0x=士…2分3f(r)0f(r)减减1-264分x、3+,f(x==f(3)=2√36分(I)Wx∈(0+∞),smx-a+>0恒成立,设g(x)=sinx-aax+=,g(x)=cosa. a, th(r)=g().h(x)=-sinx+x,设u(x)=x-sinx,u'(x)=1-cosx20,所以(x)在(0,+x)是递增u(x)>a(O)=0,即h(x)>0.∴M(x)在(0.+∞)递增,19分g(x)>g(0=1-a①当1-a20时,即a≤1,g(x)>0,在(0+∞),g(x)>g(O)=0符合题意②当1-a<0时,即a>1,存在x∈(0,+∞),使g(x)=0在(Ox)上,g(x)<0.g(x)是减函数,所以(Ox)上,g(x)

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