题目内容
6.Like all animal species,plant species must spread their offspring to suitable areas where they can grow and pass on their parents'genes.Young animals generally spread by walking or flying.Because plants don't have that ability,they must somehow hitchhike(搭车).Some plant seeds scatter by blowing in the wind or floating on water.Many other plant species,though,trick an animal into carrying their seeds.How do they do this?They enclose the seeds within a tasty fruit and advertise the fruit's ripeness by its colour or smell.The hungry animal collects and swallows the fruit,walks or flies off,and later spits out the seeds somewhere far from its parent tree.Seeds can thereby be carried for thousands 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 tactics.When strawberry seeds are still young and not yet ready to be planted,the surrounding fruit is green,sour and hard.When the seeds finally mature,the berries turn red,sweet,and tender.The change in the berries'colour serves as a signal to birds which then eat the strawberries,fly off,and eventually spit out the seeds.
Naturally,strawberry plants didn't set out with a conscious intention of attracting birds only when their seeds were ready to be dispersed.Nor did birds set out with the intent of planting strawberries.Rather,strawberry plants evolved through natural selection.The sweeter and redder the final strawberry,the more birds spread its ripe seeds; the greener and more sour the young strawberry,the fewer birds destroyed the seeds by eating berries before the seeds were ready.
46.What does the underlined word"dispersed"in the third paragraph mean?A
A.spread
B.eaten
C.born
D.planted
47.For plants,which of the following is NOT a way of spreading their offspring to suitable areas?D
A.Hitchhiking.
B.Blowing in the wind.
C.Floating on water.
D.Tracking an animal.
48.Which strategy does the example of wild strawberries describe?D
A.The conscious intent of attracting birds.
B.Spreading by walking.
C.Spreading by flying.
D.The strategy of taking a lift.
49.Why does the author describe how strawberry seeds are spread?C
A.To show plants are good at adapting to the environment..
B.To show strawberry's special way.
C.To show the plant has different ways of spreading seeds.
D.To show the mystery of plant.
50.What's the passage mainly about?B
A.How animals disperse offspring.
B.How plants disperse their offspring.
C.Plant evolution.
D.Plants'hitchhiking on animals.
分析 本文讲述植物在动物的帮助下传播自己后代的方式.
解答 46.A 本文讲的是植物成熟之后种子的传播.此句话意思:草萄在成熟的时候不是有意吸引鸟儿来帮它们传播种子,因此dispersed的意思是spread"传播".故答案为A
47.D 第一段第三句Because plants don't have that ability,they must somehow hitchhike(搭车).出现hitchhike,第四句Some plant seeds scatter by blowing in the wind or floating on water.出现blowing in the wind 和 floating on water,故答案为D
48.D 根据When the seeds finally mature,the berries turn red,sweet,and tender.The change in the berries'colour serves as a signal to birds which then eat the strawberries,fly off,and eventually spit out the seeds.可知草毒成熟之后,被鸟啄食,因而种子被带到各地.这种传播并不是有意识的(A),也不是通过走路(B)或飞行(C).故答案为D
49.C第一段Like all animal species,plant species must spread their offspring to suitable areas where they can grow and pass on their parents'genes.讲述了植物种子的传播有多种方式,第二段中的草莓是其中一个例子.故答案为C
50.B文章讲述了本文讲述植物在动物的帮助下传播自己后代的方式,所以可以概括为植物种子的传播.故答案为B
点评 做阅读时经常犯错的主要原因是,仅凭读过文章后残留在脑海中的一丝印象来勾选答案,这样便很容易掉入出题人故意设布下的题目陷阱.所谓阅读理解,对于题目的理解一定要忠实于原文,因此,每一道题都应该与原文作全面的对比与核查,再得出答案.也就是说,阅读理解的每一道题目,在原文都应该有明确的出处,我们把这一出处叫做原文相关句,(1)排除与原文相关句主题不一致的选项(2)排除与原文相关句态度相反的选项 (3)排除用于过于极端或负面的选项(4)注意结合文章主旨和主题去排除.
A. | left out | B. | cut out | C. | dried out | D. | tested out. |
A. | to be made | B. | to make | C. | being made | D. | making |