小测验：选择正确的单词

1. The rock mass produced by an intrusive process.
   侵入岩浆岩浆侵入过程中生成的岩块
2. A mass of incalculable figures.
   一大堆无法计算的数字
3. We must take pains to do meticulous work among the masses.
   我们必须下功夫在群众中做细致的工作。
4. A liter of gas has less mass than a liter of water.
   一公升汽油的质量比一公升水的质量小。
5. a painful hush seized that crowded mass.
   一阵痛苦的沉寂笼罩着拥挤的人群。

　1个名词解释