重点讲解：
1. an alternative to 可供选择的；可供替代的；
例句：New ways to treat arthritis may provide an alternative to painkillers.
关节炎的新疗法可能是止痛药之外的另一种选择udSu~qh9=.7gQI(y。
2. die of 死于……；
例句：The little match girl died of hunger and cold.
卖火柴的小女孩饥寒交迫而死)~x+K8gVXzZ04p。
3. account for （数量或比例上）占；
例句：Energy and resources now account for about 7% of the companies investments, up from 5% a year earlier.
能源和资源目前占公司投资额的约7%，高于一年前的5%h,(;o67j6czWUob。
4. according to 据…所说；按…所载；
例句：According to research, only one smoker in a hundred is able to kick the habit without some kind of help.
研究表明， 一百名吸烟者中只有一名能够不借助任何帮助成功戒烟d]H7BOmdrW+。