2022英语周报高考NP高三答案

16.参考答案①2;②1说明分析根据题意,(ax-1)6=a6×(-1)x5+6a5×(-1)x5+15a4×(-1)2x4+20a3×(-1)3x3+15a2×(-1)4x2+6a1)5x+(-1)6=a6x6-6a5x5+15a4x4-20a3x3+15a2x2-6ax+对于①,若(ax-1)6展开式中x3的系数为-160,则有一20a3=-160,解得a=2对于②,由a=2,得(ax-1)=(2x-1)6,令x=1可得(2x-1)6=16=1,即展开式中各项系数之和为1.故答案为:①2;②1

【答案与解析】本文是一篇应用文。文章主要介绍了四种可以送给老年人的礼物。21.B细节理解题。根据第一段的“ Older adults can be a challenge to shop for."及“ In this list, you re sure tofind a thoughtful and useful gift that improves their everyday life.”可知,这个清单上列的是适合送给老年人的礼物22.C细节理解题。根据2. Warm comfort部分“ Theyre especially helpful for anyone who has troublesleeping, feels anxious, or would just enjoy feeling more relaxed. "a] %, Waowoo Adult Weighted Blanket ix个产品是能够缓解焦虑的23.D细节理解题。根据4. Mobility部分“ This high-tech walker restores(恢复) independence and dignity bycombining the benefits of a walker and raised toilet seat.”可知,使用这个助步器可以使不方便的老年人能够独立使用厕所。

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