练习材料：
[Day 1765 2019-07-27]
Lesson 26-2The past life of the earth
The remains of plants and animals that lived on land are much more rarely
preserved, for there is seldom anything to cover them over. When you think of the
innumerable birds that one sees flying bout, not to mention the equally numerous small
animals like field mice and voles which you do not see, it is very rarely that one comes
across a dead body, except, of course, on the roads. They decompose and are quickly
destroyed by the weather or eaten by some other creature.
It is almost always due to some very special circumstances that traces of land
animals survive, as by falling into inaccessible caves, or into an ice crevasse, like the
Siberian mammoths, when the whole animal is sometimes preserved, as in a
refrigerator.
任务配置：L0+L1+L4
知识笔记：
innumerable adj. 多得数不清的; 很多的;
numerous adj. 众多的; 许多的;
field mice n. 田鼠;
voles n. 田鼠;
decompose v. 腐烂; (使) 分解;
inaccessible adj. 难以达到的; 不可得到的;
crevasse n. (尤指冰川等的) 裂缝，裂隙，冰隙;
Siberian mammoths 网络 西伯利亚猛犸;
练习感悟：
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