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1.Life on land probably began about 430million years ago,thought it had existed in the water for perhaps as long as 3,000million 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 food necessary to live,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 near water 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 100million years,plants had developed their roots,and some developed tall tree-like forms,since height was very important in competition for sunlight.About 300million 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.

28The main idea of the first paragraph isC.
A Life on land probably began about 4,300years 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
29Plants with roots appeared aboutC       million years ago.
A.430         
B.330          
C.300            
D.100
30  The first trees were like modern trees in most ways except thatC.
A They do not have branches   
B.They do not have flowers
C.They do not have seeds     
D.They do not need sunlight.

分析 本文主要讲述动植物的起源,以及时间发展过程.本文主要讲述动植物的起源,以及时间发展过程.

解答 CCC
28   C 细节题. 根据第一段no animals could have been living if plants hadn't been on land first.可知没有植物,动物根本不能存在,故选C.
29   C   细节题. 根据文章第一段Life on land probably began about 430million years ago,thought it had existed in the water for perhaps as long as 3,000million years.最早出现的植物在四亿三千万年前,一亿年后植物开始生根,即三亿三千万年前. 故选C.
30  C  细节题. 根据文章最后一段They had roots,leaves,wood,but mostly they had not developed seeds.可知最早的树木在很多方面像现在的树木,除了它们没有种子.

点评 学生需要认真阅读原文,把握文章大意,对文章脉络有整体的了解,能仔细查找文中细节,并能根据文章内容进行合理的推测判断.

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