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
63
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
【S4】
选项
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/qsV7777K
0
大学英语四级
相关试题推荐
Whenriskofdeathfromheartattackisplottedonagraphagainstalcoholconsumption,studiesconsistentlyshowaU-shapedcur
Somepeoplefeelsadordepressedduringthewintermonthsinnorthernareasoftheworld.Theymayhavetroubleeatingorsleep
Somepeoplefeelsadordepressedduringthewintermonthsinnorthernareasoftheworld.Theymayhavetroubleeatingorsleep
A、Books.B、Multimediamaterials.C、Seriallikejournalsandmagazines.D、Notgiven.C
A、Parentsareverystricttowardstheirchildren.B、Parentsworkhardandhavelittletimefortheirchildren.C、Parentsarenot
Themodernageisanageofelectricity.Peoplearesousedtoelectriclights,radios,televisions,andtelephonesthatitish
Afoodbankisthecenteroffoodcollectionanddistributioninacommunity.Thisfoodusually【S1】______.fromgrocerystoreso
The1920ssawtheemergenceofwidespreadcarownershipintheUnitedStates.Assembly-line【C1】______madecarswonderfullyche
A、Theman’sbusinesstripwassuccessful.B、Histrainwasdelayed.C、HisjourneybackfromScotlandtookhimfourhours.D、Heha
随机试题
患儿男,4岁。1岁前并未见明显异常,1岁后家长发现患儿不理人,目光不注视人,不会用言语表达要求,也不会用手指;1岁前本已会叫爸妈,现在也不叫了。不跟其他小朋友玩,也不会玩玩具,拿到任何玩具都喜欢闻。喜欢旋转的东西,常常一个人无目的地转圈,特别喜欢看天气预报
设图示两根圆截面梁的直径分别为d和2d,许可荷载分别为[P1]和[P2]。若两梁的材料相同,则[P2]/[P1]=
安庆长江公路大桥及接线工程采用双向四车道高速公路标准,路基与大桥同宽为26m.设计行车速度为100km/h,总投资估算为13.27亿元。大桥桥位区位于长江下游平原,江北为安庆市,江南为东至县大渡口镇,地势平坦开阔,属北亚热带湿润季风气候区,雨量充沛,梅雨显
下列关于影响项目组织结构因素的叙述中,正确的是()。
后张法预应力混凝土简支梁施工要点包括()。
微机主机箱内用来固定光盘驱动器的支架(由镀锌钢板制成)
基金托管年费率国际上通常为0.2%左右。目前,我国股票型封闭式基金按照()的比例计提基金托管费。
下列选项中,有关科技词汇与出处对应关系错误的是:
以下各项关于发展循环型经济的说法,正确的有()。
设f(x)=ax+b(a≠0),且f(10)=21,若f(2),f(7),f(22)成等比数列,则f(1004)=______.
最新回复
(
0
)