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
外语
Many trees and shrubs change color in fall. Three factors influence fall’s colorful farewell-leaf pigments (色素), length of night
Many trees and shrubs change color in fall. Three factors influence fall’s colorful farewell-leaf pigments (色素), length of night
admin
2010-05-26
22
问题
Many trees and shrubs change color in fall. Three factors influence fall’s colorful farewell-leaf pigments (色素), length of night, and weather. The timing of the color change is mainly【S1】______by the increasing length of night. None of the other【S2】______influences, such as temperature, rainfall, food supply, are as unchanging as the【S3】______increasing length of night during fall. As days grow shorter, and nights grow longer and cooler, biochemical processes in leaves begin to【S4】______the landscape with an explosion of colors. And nature puts on one of its most wonderful displays of beauty.
The timing of the color change varies by【S5】______. Some species in southern forests can become vividly colorful in late summer while all other species are still vigorously green. Oaks put on their colors long after other species have already【S6】______their leaves. These differences in timing among species seem to be【S7】______inherited, for a particular species, whether on a high mountain, or in warmer lowlands, will change color at the same time.
However, some species are【S8】______. Pines, for example, are green all the year round because they have toughened up. They have developed over the years a needle-like leaf, which is【S9】______with a heavy wax (蜡状的) coating. And the liquid inside their cells contains cold-resistant elements. So the leaves of evergreen can safely withstand all but the most【S10】______winter conditions, such as those in the Arctic.
A) severe E) species I) shed M) covered
B) paint F) regulated J) steadily N) attractive
C) genetically G) enthusiastic K) evergreens O) faded
D) present H) environmental L) present
【S6】
选项
答案
I
解析
转载请注明原文地址:https://kaotiyun.com/show/SsV7777K
0
大学英语四级
相关试题推荐
Time,asweknowit,isaveryrecentinvention.Themodemtime-senseishardlyolderthantheUnitedStates.Itisaby-produc
A、HewantstomakeanappointmentwithMr.Smith.B、HewantstomakesurethatMr.Smithwillseehim.C、Hewantstochangethe
Somepeoplefeelsadordepressedduringthewintermonthsinnorthernareasoftheworld.Theymayhavetroubleeatingorsleep
A、TheStudents’Union.B、Theuniversityadministration.C、Thefaculty.D、Theseniorstudents.A
ComputersConcernYouWhenCharlesBabbage,aprofessorofmathematicsatCambridgeUniversity,inventedthefirstcalculati
"Theworld’senvironmentissurprisinglyhealthy.Discuss."Ifthatwereailexaminationtopic,moststudentswouldtearitapar
WhowontheWorldCup1994footballgame?WhathappenedattheUnitedNations?Howdidthecriticslikethenewplay?【C1】______a
Forthispart,youareallowed30minutestowriteALettertotheManagerofaSupermarket.Dmshouldwriteatleast120words
The1920ssawtheemergenceofwidespreadcarownershipintheUnitedStates.Assembly-line【C1】______madecarswonderfullyche
Incolonialtimeswomenprovidedhealthcarefortheirfamiliesandneighbors.Doctorswereoftennot【S1】______,andatthattim
随机试题
男性,48岁。头晕、乏力、下肢水肿3个月,登三楼感到心慌、气急2周来门诊。体检:重度贫血貌,心率120次/min,心尖部SMⅢ,肝脾不肿大。化验:血红蛋白66g/L,血细胞压积0.20(20%)。对此患者门诊首选检查项目是
能用一针法麻醉的三条神经是
空腹听诊出现振水音,可见于()
我国《碾压式土石坝设计规范》规定,高度在30~70m之间的坝称为()。
关于竣工阶段质量监督,下列表述中正确的是()。
下列属于商业银行流动性风险的原则是()。
【2014四川雅安】一次考试的失利让李东很沮丧,李东回家时遇到邻居张阿姨并得到张阿姨的安慰鼓励,使得李东振作起来。我们可以称张阿姨为李东的教育者。()
11,12,16,39,67,122,()。
A、第一名B、第二名C、第三名D、没有名次B本题考查人名和名次,“亚军”就是“第二名”,选择B。
WhatMakesMetheWeightIAm?There’snoeasyanswertothisquestion.Yourgeneticmakeup,thephysicaltraitsthatgetpassed
最新回复
(
0
)