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
47
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
【S8】
选项
答案
K
解析
转载请注明原文地址:https://kaotiyun.com/show/0sV7777K
0
大学英语四级
相关试题推荐
A、Equivalenttoahydrogenbomb.B、EquivalenttotonsofTNT.C、Equivalenttotonsofhydrogenbombs.D、EquivalenttoatonofT
A、Insectsarearoundlongbeforepeoplewere.B、Therearefarmoreinsectsthantherearehumans.C、Insectsleadahappierlife
DowningStreetisthemostexclusivestreetinBritain,notbecauseitonlyhasthreehousesalongitsshort【B1】______,norpart
A、Atagasstation.B、Atahospital,C、Atabank.D、Atschool.B
Themodernageisanageofelectricity.Peoplearesousedtoelectriclights,radios,televisions,andtelephonesthatitish
Afoodbankisthecenteroffoodcollectionanddistributioninacommunity.Thisfoodusually【S1】______.fromgrocerystoreso
Afoodbankisthecenteroffoodcollectionanddistributioninacommunity.Thisfoodusually【S1】______.fromgrocerystoreso
FromthetopofTempleIV,densejunglecanopy(遮篷)spreadstothehorizonineverydirection.Some215feetbelowliesTikal,th
Oneinfourfamiliesarehurtbyalcoholism.Drinkingplaysa【B1】______in80percentofdeathsbyfire,65percentof【B2】____
A、Nineteenth-centuryAmericanpainting.B、Americanarchitecturalhistory.C、Introductiontoeconomics.D、Eighteenth-centuryAmer
随机试题
A.葡萄糖B.果糖C.维生素D.脂肪乳E.氨基酸可以改善心肌缺血的是()。
X线头影测量标志点,“N”代表()。
下列关于法律规则和法律原则的说法中。错误的是哪一项?()
现行规范规定,进行比例尺为1:10000的海岸地形测量时,海岸线以上应向陆地测进的距离最小应大于()m。
若甲因偷税罪被判处有期徒刑4年,则()对甲不适用。根据本案,对甲的量刑情节还有()。
据统计,2012年1~10月我国农产品进出口总额1414.48亿美元,较上年同期(下同)增长16.27%。其中,出口500.52亿美元,增长4.49%,进口913.96亿美元,增长23.92%。2011年1~10月我国农产品约实现:
地大物博的非洲几乎被瓜分完毕是在()。
采用段式存储管理时,一个程序如何分段是在()决定的。
影响资本周转快慢的因素有很多,其中关键的因素有
Butterfliescomeinmorethan17,000species,displayingawingpatternuniquetoeachone.
最新回复
(
0
)