2. 外语
  3. Life on land probably began about 430 million years ago, though it has existed in the water for perhaps much as 3 000 million ye

Life on land probably began about 430 million years ago, though it has existed in the water for perhaps much as 3 000 million ye

admin2009-02-15  67
问题     Life on land probably began about 430 million years ago, though it has existed in the water for perhaps much as 3 000 million years. When we think of the first life on land, we probably think of strange animals coming out of the oceans, but, in fact, no animals could have been living if plants had not been on land first. Plants had to be on land before animals arrived. They supplied the first land animals with the surrounding and food necessary, since they--the plants are the only form of life that is able to get and store energy.
    The first plants to exist out of the water were probably certain kinds of algae(海藻)which were followed by other plants that grew close to the ground and needed water in which to reproduce. Once their move to land had been made, however, evolution(进化)took place quickly. By the end of 100 million years, plants had developed their roots(根),and some had got tree- like forms since height was very important in gaining sunlight. About 300 million years ago, much of the world was covered with forests of huge trees. In most ways they were like modem trees. They had roots, leaves, wood, but mostly they had not developed seeds.
选项 A、life on land probably began about 430 years ago
B、the first animal on land came from oceans
C、there wouldn’t be animals without plants
D、plants are the only form of life that is able to get and store energy
答案C
解析 见第一段…no animals could have been living if plants had not been on land first．
转载请注明原文地址:https://kaotiyun.com/show/GuAd777K
本试题收录于： 公共英语二级笔试题库公共英语（PETS）分类
0

公共英语二级笔试

公共英语（PETS）

相关试题推荐
随机试题
最新回复(0)