题目

根据句意及括号内所给单词的提示填空。【1】Tom likes watching tennis but he_________ (like) playing it.【2】Cindy is friendly. She always _________ (help) others.【3】English people don't like the number 13 because they think it’s a(n) _________ (lucky) number.【4】This game is very important. You must take it __________(serious).【5】Anna is_________ (talent) in dancing. She dances best in her school.【6】Susan wants to be a(n) _________ (success) actress.【7】The_________ (win) of the singing competition are from China.【8】Yesterday Ann_________ (appear) at如图是2008年北京奥运会奖牌，奖牌正面为国际奥委会统一规定的图案，奖牌背面镶嵌着玉石，形象诠释了中华民族自古以来以“玉”比“德”的价值观，是中华文明与奥林匹克精神的一次“中西合璧”。奖牌分为金牌、银牌和铜牌。其中金牌由纯银、玉石、纯金组成，金牌的总体积约为23 cm3，镶嵌玉石的体积约为5.4 cm3，纯金的质量约为6 g。已知ρ玉＝3.0 g/cm3，ρ金＝19.3 g/cm3，ρ银＝10.5 g/cm3。请问：(1)一枚金牌约需要玉石多少克？(2)一枚金牌除了玉石和纯金外，还需纯银约多少克？