人教新课标高中英语必修二:Unit4 WIldlife protection-Language points
人教新课标高中英语必修二:Unit4 WIldlife protection-Language points第4页

15….as… 一边……一边…… He sang a song as he walked.

16.protect… from… stop/keep/prevent… from…

17.pay attention (to) look forward to thanks to

Preposition

18.affect (V):have an effect on 1)A sudden change may affect your health. 2)Did the medicine hve any effect? 3)The film had quite an effect on her.