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

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

admin2008-11-13  58
问题     Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as long as 3, 000 mil lion 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. (76) They supplied the first land animals with food necessary to live, since they 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 near water and needed water in which to repro duce. Once the 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, and some developed tall tree like forms, since height was very important in competing for sunlight. About 300 million years ago, much of the world was covered with forests of huge trees. In most ways they were like modern trees. They had roots, leaves, wood, but mostly they had not developed seeds.
选项 A、life on land probably began about 4, 300 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 ABD项都是第一段巾的内容，但都不是主要内容，如果没有看清楚题目中要求的main idea，这道题很有可能选错，因为ABD项都是第一段中的内容，如果看清楚题目中问的是主要内容，那么这道题并没有什么难度。第一段就是说明陆地上如果首先没有植物，动物将无法生存。因此正确答案应该是C。
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