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
Like all animal species, plant species must spread their offspring to suitable areas where they can grow and pass on their paren
Like all animal species, plant species must spread their offspring to suitable areas where they can grow and pass on their paren
admin
2010-01-18
27
问题
Like all animal species, plant species must spread their offspring to suitable areas where they
can grow and pass on their parent’s genes.
Young animals generally spread by walking or flying. 【M1】_____
Because plants don’t have that ability,
they may somehow hitchhike. Some plant seeds scatter by 【M2】_____
blowing in the wind or floating on water. Many other plant species, though, trick an animal into
carrying their seeds. How do they do? They enclose them within a tasty fruit and advertise the fruit’s
ripeness by its color or smell.
The hungry animal collects and swallows the fruit, walks or flies off, but 【M3】_____
later spits out the seeds somewhere far from its parent tree.
Seeds can thereby be carried thousands 【M4】_____
of miles. It may surprise you to learn that plant seeds can resist digestion. In fact, some seeds
actually require passage through an animal’s body before they can grow. Wild strawberries offer a
good example of hitchhiking tactic.
When strawberry seeds are still young and not yet ready to be 【M5】_____
planted, the surrounding fruit is green, sour, and hard.
When the seeds final mature, the berries turn 【M6】_____
red, sweet, and tender. The change in the berries’ color serves as a signal to birds which then eat the strawberries, fly off, and eventually spit out the seeds.
Naturally, strawberry plants doesn’t set out 【M7】_____
with a conscious intent of attracting birds only when
their seeds were ready to be dispersed away. 【M8】_____
Nor did birds set out with the intent of planting strawberries. Rather, strawberry plants evolved
through natural selection.
The sweeter and reder the final strawberry, the more birds spread its ripe 【M9】_____
seeds;the greener and more sour the young strawberry,
the birds destroyed the seeds by eating 【M10】_____
berries before the seeds were ready.
【M2】
选项
答案
may改成must
解析
情态动词语气不同,must强调必须,不得不,只能。
转载请注明原文地址:https://kaotiyun.com/show/WAvO777K
0
专业英语八级
相关试题推荐
ManypeoplewillhaveheardoftheAlexandertechniquebuthaveonlyavagueideawhatitisabout.Untilearlierthisyear,Id
A、ThiskindOftaxonimportedgoodsisunnecessary.B、Topracticeeconomy,thegovernmentimposesatax.C、Atariffisrecommen
Americanshavefourprimaryavenuesformakingfriends:atwork,atschool,throughahobbyora【C1】______suchasvolunteerwork
A、Icannotfinishthereportintime.B、Ihatetojoininsocialactivitiesthisweekend.C、Ihavetoworkextratimeoverthew
IwatchedasDr.IanStead,thearchaeologistinchargeoftheexcavation,begancarefullyremovingthepeatwithaclaymodelli
A、Thecustomermustpaycashforhisinsurance.B、Thecustomermustpayforhisinsurancebycreditcard.C、Thecustomermustge
Awisemanoncesaidthattheonlythingnecessaryforthetriumphofevilisforgoodmentodonothing.So,asapoliceoffice
Endingamarriagecanbeasad【C1】______experience,especiallyforchildren.IntheUnitedStates,thenumberofchildren【C2】___
A、Whypeoplewilltakeplasticsurgery.B、Howcosmeticsdevelopinitslonghistory.C、Howthechangeoffashionledtothedeve
Thekoala,oneofAustralia’smosttreasuredcreatures,isintrouble?InQueensland,thevaststateinAustralia’snortheastern
随机试题
成年男性体液总量大约占体重的比值是
【背景资料】某公司承建某大学办公科研综合楼项目,在装饰装修阶段,大学城建设单位追加新建校史展览馆,紧临在建办公科研综合楼。总建筑面积2160m2,总造价408万元,工期10个月。屋面设女儿墙,屋面防水材料采用SBS卷材。考虑到工程较小、
会计软件应当具有对机内会计数据进行查询的功能。数据查询功能应满足国家统一的会计制度规定的内容和格式要求。()
Excel提供的工作表范围为128列。()
传统学派认为,单极从根本上是不稳定的,美国任何轻微的违规之举都有可能引发危险的动荡。有人认为情况正好相反:单极是持久的,也是和平的,最大的危险是美国的行动太少。作为一个拥有无可争议的优势的国家,美国比任何国家更有可能轻视这一国际系统和总的挑战。但由于这一系
MissUniversetookplaceinAthens,Greece.Thejuntawasstillinpower.Isawaheckofalotofjeepsandtroopsandmachine
VisualFoxPro的系统数菜单,其主菜单是一个
在VisualFoxPro中,如果希望内存变量只能在本模块(过程)中使用,不能在上层或下层模块中使用。说明该种内存变量的命令是( )。
A.divisionB.sufficientC.constantD.depthsE.exteriorF.whereasG.stableH.provedI.externalJ.measuringK.environme
_____isannouncedinthepapers,ourcountryhaslaunchedalargescalemovementagainstsmugglingandfraudulentactivitiesin
最新回复
(
0
)