2022英语周报book5 unit2答案

15.(5分)(1)m(1分)3m(1分)(2)不必(2分)不会(1分)【解析】(1)若一根绳挂的钩码质量为m,另一根绳挂的钩码质量为2m,则两绳子的拉力分别为mg、2mg,两绳子拉力的合力F的范围是2mg-mgsF≤mg+2mg,即mg≤F≤3mg,三力的合力为零,则第三根绳挂的钩码质量范围在m~3m之间,即第三根绳挂的钩码质量一定大于m且小于3m。(2)本实验不是先用一根绳拉结点,然后用两根绳去拉结点,使一根绳拉的作用效果与两根绳拉的作用效果相同,而是三根绳都直接拉O点,所以O点的位置可以改变:若桌面不水平,也不会影响实验的结论。

【语篇导读】本文是一篇说明文。在西方的侍统观念中,成年意味着离开父母独立生活。然而现在越来越多的西方年轻人更傾向于与父母住在一起28.C【解析】推理判断题,根据第一段中的“ But through working as a part-time skating instructor andrestaurant server, she isn ' t able to earn enough to live anywhere other than home.”可知,如果不住在家里,通过做兼职滑冰教练和餐馆服务员,Hipp是不能赚取足够的钱来找一个地方住。所以选C,29.A【解析】推理判断題。根据" It finds that millennials have redefined the ties that connect parents anchildren. Millennials see their parents as peers, friends and instructors. Nearly three quarters talked withtheir parents more than once a week during college.”可知,千禧一代和父母相处得很好。故选A30.B【解析】細节理解题。根据“ Although job growth for millennials since2014 has improved, that doesn'tnecessarily mean that millennials are starting to fly the nest.”可知,尽管就业有所改善,这并不意味着年轻人会离开家。故选B。31.D【解析】写作意图題。纵观全文可知,本文主要介绍了在美国,越来越多的年轻人倾向于与父母同住的这样一种社会趋势,故D项最能概括作者的写作目的。

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