今日学习
什么是首尾呼应的主题句呢，一起来看看吧。
小方法
首尾呼应的主题句
通常是指文章开头和结尾相互对应。了解这一点有利于根据文章开头和结尾进行综合推理。
小小练习
Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as long as 3000 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.
Which of the following is TRUE?
A. Algae have existed for more than 430 million years.
B. It is impossible that algae might be the earliest plant on land.
C. Plants get food from animals in the oceans.
D. Evolution began after animals appeared on land.
译文反白可见：
译文：陆地上出现生命的时候可能是4.3亿年前,尽管它已经存在于水中或许有30亿年了。当我们想到陆地上出现的第一种生物时，,我们可能会想到从海洋里出来的奇怪的动物，但是，事实上，如果陆地上的植物没有出现，那么没有动物可以存活。植物必须在动物之前达到。它们为第一批的动物提供必要的食物，因为植物是唯一的一种形式能够得到和储藏能量。
存在水里的第一种植物可能是海藻，紧随其后的是其他植物,生长接近地面,需要水来繁殖。
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