The idea of "evolution" is very clearly shown in the story of horse. Millions of years ago, the horse called Eohippus with small teeth and four toes lived in the ground where the plants were easy to chew. Because of changing climate and plants, horses with larger teeth, three toes, till one toe appeared. Finally Eohippus died out and the one-toed survived so well over the grasslands by the time the first man appeared on earth. Darwin considered all modem animals had gradually developed and so had man. The earliest men, with sloping foreheads and much smaller brains, like Eohippus seem to have died out—the weak ones died out and the well- equipped ones survived. Also, like the animals on the different Galapagos Islands, men developed differently according to the condition in which they lived. People living in very hot countries developed black skins, which are good protection against the sun's rays, and people like the Mongols and Eskimos living in very cold climates have flatter faces and rounder bodies than people else where, to protect them from the cold.
单选题
The word "evolution" in the passage means ______.
【正确答案】
A
【答案解析】“evolution”这个词出现在文章的第一句，根据全文讲述的马的进化过程，特别是文章的第5句：“Darwin considered all modern animals had gradually developed and so had man.”可以得出词语的正确含义。所以正确答案选A。
单选题
According to the passage, we know that ______.
【正确答案】
A
【答案解析】从文中“men developed differently according to the condition in which they lived”可以分析出，正确答案是A，而其他3项B，C，D都是错误答案。
单选题
Which statement is NOT TRUE?
【正确答案】
D
【答案解析】由文章中的“the earliest men...the well equipped ones survived”可知，D选项是错误的。而其他3项都可以在原文中找到。