小测验：选择正确的单词

1. The grass was covered with frost in the early morning.
   清晨玻璃上满是霜。
2. The autumn chrysanthemum braves the frost.
   秋菊傲霜。
3. The crops were not touched by the early frost.
   庄稼未受到初霜的损害。
4. Flowers perish when frost comes.
   霜降时花即枯萎。
5. Frost hardened the water of the puddles into ice.
   严寒使水坑里的水结成了冰。

　1个名词解释