Millions years ago much of our earth was covered with blocks (块) of ice. These ice blocks were as tall as high buildings in modern cities. Most of the ice was in the northern (北方的)part of the world. Then the ice blocks started to move south. Cold and rain came with the ice. Animals and people had to move. At last, the ice began to melt (融化). After half a million years, most of it had melted. More than half of the earth became covered with water. The climate became much warmer. Things began to grow. The earth began to look the way it looks today. 小题1:Millions of years ago our earth was very _________________.
a. Forests grew b. Food became harder to find c. Fishing became easier d. The temperature dropped.
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