Question

阅读理解 　　Life on land probably bagan about 430 million years ago, though it has existed in the water for perhaps as 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 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(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 modern trees．They had roots, leaves, wood, but mostly they had not developed seeds． (1) The main idea of the first paragraph is ________． [　　] 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 (2) Which of the following is TRUE? [　　] A． Algae has 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． (3) Plants with roots appeared about ________ million years ago． [　　] A． 430 B． 300 C． 330 D． 100

Answer 1

答案：1．C;2．A;3．C;
解析：

(1)	由第一段，no animals could have been living if plants had not been on land first，可知．
(2)	由第二段可知．
(3)	最先出现的植物在四亿三千万年前，一亿年后，植物开始生根，也就是三亿三千万年前．