2022英语周报OT12答案

24-27 DDBB24D【解析】根据第二段“ When my children were young and likely to cause accidents, Ialwaysthought about what i could do to avoid an“ if onlv moment."可知。25D【解析】根据第三段“ We all know people who lost a loved one and regretted that…,"可知26B【解析】根据第三“ But then i thought about the fact that he's84 vears old and i realizedthat i shouldn' t give up an opportumity to see him.”可知。27B【解析】根据后一段“ I know there will still be occasions wheni have to say“ if onlyabout something. but mv life is definitely better.”可排除A和C;根据第三段“It' s equallyimportant to avoid“ if only" in our pers onalrelationships:可排除D

3.(本小题满分10分)【选修45:不等式选讲】(1)解:当x∈[-2,2]时,|x+2=x+2,所以f(x)≥4-x+2恒成立即|2x-a|≥4-x-2,∴2x-a≥2-x或2x-a≤-2+x,∴a≤3x-2或a≥x+2恒成立,所以有a≤(3x-2)或a≥(x+2)又x∈[-2,2],∴a≤-8或a≥4,所以实效a的取值范围是(-∞,-8]U4+∞)(5分)(2)证明:要证x-y+≤m,只需证|2x-4y+a1≤3m由f(x)≤m,f(y)≤m,得2x-a≤m,|2y-al图≤则|2x-4y+al=|(2x-a)-2(2y-a)≤(2x-a)+12(2y-a)≤m+2m=3m,所以(10分)

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