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
46
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
【S1】
选项
答案
F
解析
转载请注明原文地址:https://www.kaotiyun.com/show/YsV7777K
0
大学英语四级
相关试题推荐
Time,asweknowit,isaveryrecentinvention.Themodemtime-senseishardlyolderthantheUnitedStates.Itisaby-produc
OnthenightofSeptember2,1666,afirebrokeoutinabaker’sshopnearFishStreetHillinLon-don.Beforetheflameswere
OnthenightofSeptember2,1666,afirebrokeoutinabaker’sshopnearFishStreetHillinLon-don.Beforetheflameswere
Ilovetravelingbytrain.Fast【B1】______slowlocaltrainswhichstopsateverystation,【B2】______trainstakingbusinessmen
A、Hisfriendmighthavegivenhimthewrongkey.B、Hedidn’tknowwherethebackdoorwas.C、Hecouldn’tfindthekeyinthemai
we__________(本来不必叫邻居帮忙)yesterday,becauseweactuallyhadenoughhands.
Intheearlydaysoftheinternet,manypeopleworriedthataspeopleintherichworldembracednewcomputingandcommunication
A、Hewillprobablyoverchargeher.B、Heisoneofherneighbors.C、Heonlyworksonnewears.D、Hehadfixedhercarbefore.D
FromthetopofTempleIV,densejunglecanopy(遮篷)spreadstothehorizonineverydirection.Some215feetbelowliesTikal,th
A、Becauseitcanstrengthentheirbackmuscles.B、Becausetheyarenotcarryingtheirbodyweightontheirfeet.C、Becauseitin
随机试题
缩宫素的药理作用不包括:
都气丸即六味地黄丸加下列哪味药
A.侠溪B.内庭C.二间D.液门E.劳宫足少阳胆经的荥穴是
能引起心率加快、收缩压上升、舒张压下降的药物是
《特种设备安全监察条例》涉及的特种设备类型是______:a客运索道、大型游乐设施,b军事装备、航空航天器,c锅炉、压力容器(含气瓶,下同),d压力管道,e@核设施,f.电梯、起重机械。
一国是否有能力实行本币的自由兑换,取决于稳定的国际收支和是否充足的外汇准备。( )
共同基金是一种比较普遍的金融工具,以下对共同基金的描述,错误的是()。
同一控制下的企业合并,合并方以支付现金、转让非现金资产或承担债务方式作为合并对价的,应当在合并日按照取得被合并方所有者权益账面价值的份额作为长期股权投资的初始投资成本。长期股权投资初始投资成本与支付的现金、转让的非现金资产以及所承担债务账面价值之间的差额,
大规模定制[上海大学2019、2017国际商务硕士]
设c1和c2是类MyClass的对象,若将运算符"+"和"*"作为类MyClass的成员函数重载,则表达式c1+c2*c1等价于
最新回复
(
0
)