1. prevent (from )catching (确定是两个空?)
2.harmful to health(be harmful for+doing 后面接事物 be harmful for sb. to do sth.
be harmful to+sb 后面接人或物)
3.rather than
4.has been away from
5.larger that (表示人口的\"多\"或\"少\",不用\"much\"或\"little\",而要用\"large\"或\"small\"。例如: India has a large population. 印度人口众多。
Singapore has a small population. 新加坡人口少。
标准答案