小测验：选择正确的单词

1. discovery day
   (=Columbus Day)哥伦布发现美洲纪念日
   

1. They lived in hourly dread of discovery.
   他们时时刻刻担心被人发觉。
2. We are on the scent of an important discovery.
   我们掌握了一条可能导致重要发现的线索。
3. The discovery of a new planet has been reported.
   据报道已发现一颗新行星。
4. DNA discovery battles are still being strenuously fought.
   DNA发现程序之战仍旧继续进行着。
5. I warmly congratulated him on the marvellous discovery.
   我热烈祝贺他的这一神奇发现。

　4个名词解释