綜合寫作
reading passage：bison 數(shù)量減少 三點(diǎn)原因：1.bison is a source of food 2.cattle and horses compete 3.guns
lecture：1.如果是由于bison作為食物，數(shù)量應(yīng)該是從east開始減少 事實(shí)上是west開始減少
2.天氣寒冷，bison有厚厚的毛，可以抵抗寒冷，而cattle and horses就不能與之競(jìng)爭
3.nation used guns for hundreds of years.
寫作：Rather than help their children do school work，parents should encourage their children do work independently. Do you agree or disagree?