首页
登录
职称英语
Many trees and shrubs change color in fall. Three factors influence fall’s c
Many trees and shrubs change color in fall. Three factors influence fall’s c
游客
2024-02-28
38
管理
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 [br] 【S2】
选项
答案
H
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3490009.html
相关试题推荐
Socialchangeismorelikelytooccurinsocietieswherethereisamixture
Socialchangeismorelikelytooccurinsocietieswherethereisamixture
Inthepastfiftyyears,Americansocietyhaschangedagreatdeal.Fiftyye
Inthepastfiftyyears,Americansocietyhaschangedagreatdeal.Fiftyye
Inthepastfiftyyears,Americansocietyhaschangedagreatdeal.Fiftyye
Inthepastfiftyyears,Americansocietyhaschangedagreatdeal.Fiftyye
Inthepastfiftyyears,Americansocietyhaschangedagreatdeal.Fiftyye
Forthispart,youareallowed30minutestowriteacompositionentitledChange
[originaltext]M:Ihavebeenstudyingtoomuchandneedachange.SoIamjust
[originaltext]M:Ihavebeenstudyingtoomuchandneedachange.SoIamjust
随机试题
[originaltext]M:Goodmorning.WillyoubookaplanetickettoLondonforme?W
Whatisthespeakermainlytalkingabout?[br][originaltext][18]Overtimeani
Ifyou【D1】______smoothskinthatglowswithyouth,thechancesarethatats
中国人似乎很喜欢红黄两色。中国国旗就是由这两种颜色组成的。很多重大场合的装饰和重要书籍的封面设计(coverdesign)总会用到这两种颜色。国庆节天
某高速公路工程项目业主与承包人签订了公路工程施工合同,合同含有两个子项工程,估算
A.金黄色葡萄球菌 B.β-溶血性链球菌 C.大肠埃希菌 D.厌氧性链球菌
按"五轮学说"之两目白睛是()A.风轮 B.气轮 C.血轮 D.肉轮
可引起肺间质纤维化的抗心律失常药物是()A.美托洛尔 B.维拉帕米 C
下列选项中,属于货币资金业务交易、账户余额和列报的认定层次的重大错报风险的有(
铁路路基软基处理常用处理方法有()。A.换填 B.抛石挤淤 C.粉体喷射搅拌
最新回复
(
0
)