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
20
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
【S9】
选项
答案
M
解析
转载请注明原文地址:https://kaotiyun.com/show/MsV7777K
0
大学英语四级
相关试题推荐
Childrenmodelthemselveslargelyontheirparents.Theydosomainlythroughidentification.Childrenidentify【C1】______apar
Ilovetravelingbytrain.Fast【B1】______slowlocaltrainswhichstopsateverystation,【B2】______trainstakingbusinessmen
A、QuitthePsychologyclass.B、QuittheGeologyclass.C、Askthewomantohelphimwithhisstudy.D、Visitthefinancialoffice
A、Becausepeoplescanforthenewstheyareinterestedin.B、Becausedifferentpeoplepreferdifferentnewspapers.C、Becausepeo
Agreatdealofnonsenseiswrittenaboutthecharacterofanation,chieflybecausemanyobservers,influencedbynationalprid
Thewonderswhichmedicalworkershavealreadybroughtupinthediagnosisandtreatmentofdiseasesuggestthatatime
A、Jessieshouldknowthemarketingdirectorbetter.B、Jessieiswrongtofindfaultwithherboss.C、Jessieseemstohavealot
Itwas____________(直到我家)thatIrealizedthatIhadleftmycamerainthetrain.
A、Intheafternoon.B、Inthemorning.C、Intheevening.D、Atnight.B
A、Bossandsecretary.B、Dentistandpatient.C、Passengerandticketseller.D、Patientandnurse.D
随机试题
用脂肪或蜡类物质为骨架制成的片剂用无毒聚氯乙烯或聚乙烯或硅橡胶为骨架的片剂
心肺复苏后人工起搏器最适用于()。
要求测段的水准测站数为偶数目的是减弱因()引起的误差。
下列施工成本考核指标中,属于施工企业对项目成本考核的是()。
下列属于储存在企业物流系统中的重要作用的是()。
由以上数据,可以推出下列哪个结论正确?
在中国文化系统中,_____被视为一切道德规范的核心和母体。
请使用VC6或使用【答题】菜单打开考生文件夹prog3下的工程prog3,其中包含了类Polynomial(“多项式”)的定义。形如5x4+3.4x2一7x+2的代数式称为多项式,其中的5为4次项系数,3.4为2次项系数,一7为1次项系数,2为0次项(常
Surprisinglyenough,modernhistorianshaverarelyinterestedthemselvesinthehistoryoftheAmericanSouthintheperiodbefo
Manysatatthetable,lookedattheplateand______herlips.
最新回复
(
0
)