i．new words & phrases 1 .alternative adj .替换的,供选择的,其他的，两者选一的 n （ c）(二者当中)选一个 eg: 1）wind power and hydro power are two main alternative energy in the west of china.. 2) they had an alternative plan . 3) have no alternative but…… ________________________ alternate between a and b 在a 与b 之间交替 ex. 1> ____________ ways 可供选择的两种方法 2> the alternative of going or staying ___________________ (翻译)
