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
18
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:https://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
[img]2022m3s/ct_ve01202001m_eillist_0054_220308[/img][br][originaltext]Man:O
[originaltext]W:Hello,Dr.Christianson.M:Hello,Cathy,whatcanIdoforyo
Dad,WhyDidYouDoIt?Everytimethephoneringsinmyf
Inspiteofhisobjections,hissecondwifewasdeterminedtohimfromhistwos
Tosaythatthechildlearnsbyimitationandthatthewaytoteachistose
在中华人民共和国领域内的一切单位和个人,必须接受疾病预防控制机构、医疗机构有关传
患儿,9岁,上颌左侧恒中切牙舌向错位。基骨量与牙体大小协调,其他关系的无不协调。
基本生化检查:血清钠(Na)
我国商业银行将存款分为企业存款、储蓄存款和财政性存款的划分依据是()。A.存款
(2020年真题)钨极手工氩弧焊与其他焊接方法相比较的优点有()。A.适用焊接位
最新回复
(
0
)