18. A) To protect her from getting scratches.
B) To help relieve her of the pain.
C) To prevent mosquito bites.
D) To avoid getting sunburnt.
W: These mosquito bites are killing me. I cant help scratching.
M: Next time you go camping, take some precaution, say wearing long sleeves.
Q: Why does the man suggest the woman wear long sleeves?
[答案]C)。[聽前猜測]四個選項都是不定式作目的狀語，聽音時要注意說話人做事的`目的。[精解]對話中女士埋怨蚊子咬得她忍不住直撓，男士建議她下次野營時要採取防護措施穿長袖衣服。可見男士建議女士穿長袖衣服是爲了預防蚊子叮咬。故本題答案爲C)。
