2022英语周报七年级 GDY答案

23.解:(1)f(x)=x++|1-2x13x25,-3≤x≤23x+÷,x>当x <一3时,f(x)=2x312≤2-x解得-2≤x<当一≤时,f(x)≤一x-x+≤2x,解得-3当x> 时,f(x)≤-x3x+2≤2x,解得综上,原不等式的解集为{-2≤≤2)(5分)(2)由(1)可知,当x <时,f(x)=-3当-”≤x≤时,f(x)=-x+≥2;当x> 2时,(x)=3x+2>2故f(x)的最小值M=2,则a+2b=2,于是2=a+2b≥2√2ab则0 1(10分)

C【语篇导读】永远不会忘记一张漂亮的脸?果真如此吗?答案是否定的。28.D【解析】细节理解题。根据文章第三段最后a] p The test subjects were shown the faces for just afew seconds to memorize them and were shown them可知,接受測试者看了两次照片。故选D29.C【解析】词义猜测題。根据文章最后一段第二句n other words, people thought they recognized a facewithout having seen it before.可知,“ false positiveresults”"是指人们没有见过一个人却误以为认得此人的情况。故选C。30.A【解析】推理判断题。根据文章最后一段最后一句“ We obviously tend to believe that we recognize aface just because we find it attractive. Dr. Wiesesaid.可知,相较于缺乏吸引力的脸孔来说,我们会倾向于相信我们认得那些具有吸引力的面容。可推測出,如果看到不那么具有吸引力的面容,人们可能就没那么相信自己认得此人。故选A。B项,“美丽的人特别独特”。根据文章第一段 A new studysuggests that attractiveness can actually prevent the rec-gnition of faces, unless a pretty face has particularlydistinctive features, such as Angelina Jolie’s.可知,美丽和独特性是没有必然联系的。故B项错误。C项,“吸引力阻碍了对面孔的识别”。根据文章第一E p attractiveness can actually prevent the recognitionof faces可知,该选项无需推断即可得出,不符合题意,故C项错误。D项,“有吸引力的面孔容易被认出”。根据文章第一段中 attractiveness can actuprevent the recognition of faces可知,有吸引力恰恰会妨碍被认出。故D项错误。31.D【解析】推理判断题。根据文章第一段最后一a] A new study suggests that attractiveness can actuallyprevent the recognition of faces, unless a pretty face hasparticularly distinctive features, such as AngelinaJolie’s.可知作者主要是介绍实验本身,并未显露出自己对于实验结果的看法,故而是比较客观的。故选D

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