八年级上册：Unit 2 Period3 答案全解全析 三．知识解析 知识点一 短语 look through 的用法 解析 1.keep doing sthkeep doing sth．坚持／一直做某事，根据 last night 可知用一般过去时。 2.keep doing sthkeep sb.keep doing sth doing sth．使某人一直做某事 3.keep doing sth keep/stop/prevent sb.keep doing sth from doing sth.keep doing sth阻止某人做某事 答案 1.keep doing sth kept studying 2.keep doing sth keep you waiting 3.keep doing sth keep/stop/prevent people from throwing 知识点三 spend、take、cost 与 pay 解析 句意：—你知道 Mary 买这些书花了多少钱吗？—它们只花费了 200 元！ spend 的用法为：人＋spend time/money on sth.keep doing sth/ ( in) doing sth.keep doing sth ; pay 的用法为：人＋pay ( money ) for sth.keep doing sth ;cost 的用法为：物＋cost ( sb.keep doing sth ) + money。故选 C。 答案 C 知识点四 动词 finish 的用法 解析 句意：昨晚我的小弟弟直到做完他的家庭作业才去睡觉 finish doing sth．意为“做完某事”，故选 B。 答案 B 知识点五 it、one 和 that 解析 句意：—今天超市里冰箱大甩卖—真的吗我们去为你的新厨房买一台吧。 one 指代前面提到的物品中 的一个；it 指代前面提到的物品；that 那个；them 它们根据语境可知，这里指的是去买这些冰箱中的一台。 答案 A 随堂练习 答案 1.keep doing sthB 细节理解题。由第一段中的 But in the United States, you might be considered a bookworm if you cannot socialize．可知，在美国不会社交会被看作书呆子故选 B。 2.keep doing sthA 细节理解题由第二段第一句 Lots of high schools often have soccer games during the autumn term．可知， 许多美国高中经常在秋季学期里举行足球比赛故选 A。 3.keep doing sthD 推理判断题由第二段中的 go to the games in order to socialize 和第三段中的 The other common way to socialize is…可推断文章提到了两种社交方法。故选 D。 4.keep doing sthC 细节理解题根据文章第二段中的 go to the games in order to socialize 可知，去参加足球比赛是为了社交。 故选 C。 5.keep doing sthB 主旨大意题由文章最后一段可知，社交在美国是一件重要的事，但是成绩也很重要一个全面发展的学 生应该具备平衡学习和社交的能力故选 B。 随堂精练 一、根据汉语提示填写单词。 【答案】 1.keep doing sth chess 2.keep doing sth through 3.keep doing sth daily 4.keep doing sth quick 5.keep doing sth spent 二、用括号中所给词的适当形式填空。 【答案】 1.keep doing sth real 2.keep doing sth weekly 3.keep doing sth watching 4.keep doing sth cleaning 5.keep doing sth playing 三、根据汉语提示完成句子, 每空一词。 【答案】 1.keep doing sth have a few more; off 2.keep doing sth less carefully than 3.keep doing sth had a monthly test; came first 4.keep doing sth look through 5.keep doing sth Doing morning exercises 四、阅读对话内容, 从方框中选择单词或短语。并用其适当形式填空。 【答案】 1.keep doing sth smaller 2.keep doing sth more 3.keep doing sth Playing chess 4.keep doing sth happily 5.keep doing sth daily 6.keep doing sth more 7.keep doing sth to wear uniforms 8.keep doing sth easily 五、同义句改写, 每空一词。 【答案】 1.keep doing sth hardest of 2.keep doing sth spent; fixing 3.keep doing sth kept working 4.keep doing sth the most time 5.keep doing sth another twenty 六、选择方框中的单词填空, 完成句子。 【答案】 1.keep doing sth ideal 2.keep doing sth badminton 3.keep doing sth volleyball 4.keep doing sth Physics 5.keep doing sth Lunchtime 七、根据汉语完成句子, 每空一词。 【答案】 1.keep doing sth having computer lessons 2.keep doing sth went on a school trip 3.keep doing sth enough time for after-school activities 4.keep doing sth half an hour of 5.keep doing sth need to get up early 八、根据短文内容和首字母提示, 写出适当单词。 【答案】 1.keep doing sth British 2.keep doing sth finishes 3.keep doing sth offers 4.keep doing sth During 5.keep doing sth shops/stores/supermarkets 6.keep doing sth languages7.keep doing sth French 8.keep doing sth won 9.keep doing sth weekly 10.keep doing sth most