首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
Trees have a spectacular (壮丽的;奇观的) survival record. Over a period of more than 400 million years, they have evolved as the talle
Trees have a spectacular (壮丽的;奇观的) survival record. Over a period of more than 400 million years, they have evolved as the talle
admin
2007-12-30
46
问题
Trees have a spectacular (壮丽的;奇观的) survival record. Over a period of more than 400 million years, they have evolved as the tallest, most massive, and longest-lived organisms ever to inhabit the Earth. Yet trees lack a means of defense that almost every animal has: trees cannot move away from destructive forces. Because they cannot move, all types of living and nonliving enemies—fire, storms, microorganisms, insects, other animals and, later, humans—have wounded them throughout their history. Trees have survived because their evolution has made them into highly compartmented (分隔的) organisms: that is, they wall off injured and infected wood.
In that respect trees are radically different from animals. Fundamentally, animals heal, they preserve their life by making billions of repair, installing (安置) new cells or rejuvenated (恢复活力的) cells in the positions of old ones. Trees cannot heal; they make no repairs. Instead, they defend themselves from the consequences of injury and infection by walling off the damage. At the same time they put new cells in new positions; in effect, they grow a new tree over the old one every year. The most obvious results of the process are growth rings, which are visible on the cross section of a trunk, a root, or a branch.
The author implies that almost every animal is able to protect itself from destructive forces by doing which of the following?
选项
A、Moving away.
B、Calling for help.
C、Climbing up a tree.
D、Remaining with its group.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/XQLC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Basketballisasportenjoyedbymillionsoffansinatleast100countries.It’soneofthebest-knownsportsintheworld.It
Treeshaveaspectacular(壮丽的;奇观的)survivalrecord.Overaperiodofmorethan400millionyears,theyhaveevolvedasthetalle
Treeshaveaspectacular(壮丽的;奇观的)survivalrecord.Overaperiodofmorethan400millionyears,theyhaveevolvedasthetalle
Treeshaveaspectacular(壮丽的;奇观的)survivalrecord.Overaperiodofmorethan400millionyears,theyhaveevolvedasthetalle
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobserved.Threeperiodsofde
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobserved.Threeperiodsofde
随机试题
交换积分的次序:∫1edx∫0lnx(x,y)dy=______.
影响子宫颈癌预后的主要因素是
大气压力与义齿哪个结构关系最密切()
以下各项均是工程造价计价依据的类别,其中按照使用对象分类的是()。
(2009年)质量为m的质点M,受有两个力F和R的作用,产生水平向左的加速度a(见图4-49),它的动力学方程为()。
下列锻压设备中,()可以实现在一个工作行程中完成对工件的一个变形。
()是借款人以合法有效、符合银行规定条件的质物出质,向银行申请取得一定金额的人民币贷款,并按期归还贷款本息的个人贷款业务。
有三个关系R、S和T如下:则由关系R和S得到关系T的操作是
WhenIdecidedtoquitmyfulltimeemploymentitneveroccurredtomethatImightbecomeapartofanewinternationaltrend.
A、Theydidn’tcare.B、Theyhatedit.C、Theylovedit.D、Theyhavemixedfeelings.A
最新回复
(
0
)