小测验：选择正确的单词

1. His refusal to help simply pinpointed his cowardice.
   他拒绝帮助正显示他的胆小。
2. He is adamant in his refusal to change his mind.
   他毫不留情地拒绝改变主意
3. His refusal iced our enthusiasm.
   他的拒绝给我们的热情泼了冷水。
4. His silence was tantamount to a refusal.
   他的沉默就等于拒绝。
5. I'll let you have first refusal on the car.
   我将把购买这辆汽车的第一优先权交给你。

　2个名词解释