Unit7-SectionB课堂精讲+练习2023-2024学年人教版英语八年级下册

八年级英语（下） Unit 7 What’s the highest mountain in the world? Section B 一、知识点回顾 1. This elephant weighs many times more than this panda. 这只大象比这只大熊猫重很多倍。 （1）weigh既可作及物动词，表＂称重＂，也可作连系动词，表＂有……重；重＂。 I weighed the box. It weighs 20 kg. 我称了这个盒子，它重20公斤。 She is afraid of becoming fat. She weighs herself every day. 她怕发胖。每天都称体重。 【知识拓展】 其名词形式为weight。常用短语：in weight在体重方面。 The boy weighs 20 kg. ＝ The boy is 20 kg in weight. 这个男孩重20公斤。 He ____________（weight）only 70 kilos now after taking a balanced diet. （2）time在此意为＂倍数，次数＂，表示三倍或三倍以上时使用。表示 ＂A 比B长（宽、高、大、重等）N倍＂时，其结构为＂A＋be＋基数词（N＋1）＋times＋形容词比较级＋than＋B ＂。 This hall is five times bigger than our classroom. 这个大厅比我们的教室大四倍。 I have been to Beijing three times. 我去过北京三次了。 【注意】＂两倍＂可用twice表示。 表示＂A 的长度（宽度，高度，大小，重量等）是 B 的 n倍＂，可用 ＂A ＋ be ＋ 基数词（N）＋times ＋ as ＋ 形容词原级 ＋ as ＋ B＂结构。 This tree is three times as tall as that one. 这棵树是那棵树的三倍高。 His father is twice as old as he. 他父亲的年纪有他两倍大。 【知识拓展】　 （ ）—I hear you’ve bought a new house. —Yes, it costs too much. Anyway, it’s ___________ my old one. A. twice as big as B. as twice big as C. bigger two times than D. two times bigger as 2. A panda can live up to 20 to 30 years. 大熊猫能活20至30岁。 up to到达(某数量、程度等)；至多有；不多于。live up to指＂活到……岁＂。 There are up to seventy students in the classroom. 教室里学生不多于七十人。 The old man can live up to ninety years. 这位老人能活到九十岁。 Do you know his date of birth? 你知道他的出生日期吗？ 【知识拓展】　 up to的其他含义： （1）up to 直到；到……为止 Up to now everything has been successful. 到目前为止，一切都很顺利。 （2）up to sb. 某人的责任；由……决定 I think I will leave it up to you. 我想让你决定。 It’s ___________ Mr Zhang ___________ teach us English. A. up to；to B. up to；for C. up for；to D. up for；for 3. At birth, a baby panda is about 0.1 to 0.2 kilos. 出生时，一只大熊猫宝宝大约0.1到0.2千克重。 birth n. 出生;诞生。常见搭配： at birth出生时 date of birth出生日期 give birth to生孩子 What’s your date of birth?你是哪天出生的? 【易混辨析】　born/birth (1) born是bear的过去分词,意为“出生”,常用结构:sb.was/were born。 I was born in summer in 1988. 我出生于1988年的夏天。 (2) birth是名词,意为“