首页
登录
职称英语
Life on land probably began about 430 million years ago, though it has exist
Life on land probably began about 430 million years ago, though it has exist
游客
2025-07-31
1
管理
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 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://tihaiku.com/zcyy/4184956.html
相关试题推荐
Lifeonlandprobablybeganabout430millionyearsago,thoughithasexist
Mrs.BrownthoughtIwastalkingaboutherdaughter,______infact,Iwastalkin
Thistextismostprobablytakenfrom______.[br]Wemayinferthata17-year-o
Thistextismostprobablytakenfrom______.[br]Theunderlinedword"pornogra
【B1】[br]【B19】A、thoughB、andC、butD、whenC从上下旬的关系来看应是一种转折关系,答案为[C]。
Whereisthisconversationprobablytakingplace?[originaltext]W:Let’sgoinh
Wheredoesthisconversationmostprobablytakeplace?[br][originaltext]W:We
Wheredoesthisconversationmostprobablytakeplace?[br][originaltext]W:We
Wheredoesthisconversationmostprobablytakeplace?[originaltext]W:Welcome
Accordingtotheartdealer,thepainting______togoforatleastamilliondo
随机试题
[img]2018m9s/ct_etoefz_etoeflistz_201808_0021[/img][br]Accordingtotheprofes
Therelationshipbetween"meat"and"meet"isA、synonymy.B、antonymy.C、polysemy.
Youcan’tbuyhappiness.However,itlooks【C1】______youcanatleastinheri
HollywoodForsakesHistoryforEventsA)OprahWinfreycalls
“萨丕尔-沃尔夫”假说认为()A.人类的思维活动和本民族的文化有关。 B.人
患者女,28岁。已婚,平素月经规律。停经50天,突发右下腹剧烈撕裂样疼痛伴阴道少
下表为2008年我国对日本、俄罗斯两国的出口、进口额(单位:亿美元)及其增长速度
某直辖市市民刘某拥有某小区30号楼的一套房屋的所有权。因为电信运营商X在该栋楼房
国际收支均衡是指()的收入和支出的均衡。A、自主性交易 B、补偿性交
下列所得应按照“经营所得”项目缴纳个人所得税的有()A.个体工商户对外投资
最新回复
(
0
)