答案：CDBDB
词汇讲解
1. impulse 冲动，推动力
We were seized by a sudden impulse to run.
我们身不由己突然想跑.
On impulse, I picked up the phone and rang my sister in Australia.
我一时心血来潮，拿起话筒就给在澳大利亚的妹妹打了个电话。
2. taboo 禁忌,禁止接近,禁止使用
Questions and problems that were once taboo are now discussed openly.
一度视为犯忌的许多问题现在可以公开谈论了.
Any mention of politics is taboo in his house.
在他家里一提政治就犯忌.
3. pursuit 追求,追赶,工作
He exercises everyday in pursuit of health.
他为了健康而每天锻炼。
His life is spent in the pursuit of pleasure.
他一生都在寻欢作乐.
4. vulnerable 易受伤害的,有弱点的
She is very young and vulnerable to temptation/fraud.
她很年轻，易受诱惑／易受骗上当。
The potato is vulnerable to several pests.
马铃薯易受几种害虫的侵害.