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专业(GRE)考试 ·93考题精选(一)
来源:英语学习网 点击数: 更新时间:2006-5-1  
A plant grower pollinates female holly plants with pollen from male holly plants.
The grower has exactly six strains of holly plants-S, T, W, X, Y, and Z--available
for use in pollination. Male and female specimens of each strain are available.
A pollination grouping consists of at least two holly plants,one Male and one
female. For any pollination grouping,the grower can use a male of any of the six
strains to pollinate a female of any of the six strains, as long as the following
restrictions are not violated:
 
 An S female plant can be pollinated only by an S male plant.
 A T female plant can be pollinated only by a Z male plant.
 An X female plant can be pollinated by neither a T male plant nor an X
  male plant.
 In any single pollination grouping containing a Z female plant that is
  pollinated by a T male plant, there must also be an X female plant that
  is pollinated by a Z male plant.
Which of the following lists two pairs of acceptable
pollinations in a single complete grouping
   First Pair  Second Pair
  Female  Male   Female  Male
S S W S
S W W W
T Y Z Z
X X Z X
X Y Z T

————————————————————————
答案:(A)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

The grower can use a Z male plant to pollinate a female
plant of any of the following strains EXCEPT
S
T
W
Y
Z

————————————————————————
答案:(A)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

花匠可用Z雄性授粉下面哪个雌性植物,EXCEPT?
找需要由某类雄性授粉的条件,由条件1知,S female 只能由S male授粉,故A对。

The grower can choose to pollinate an X female plant
from a total of how many different strains of male plants?
One
Two
Three
Four
Five

————————————————————————
答案:(D)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

Which of the following is a complete and accurate list
of the strains whose female plants can be selected by the
grower for pollination by a W male plant?
T, W, X, Y, Z
W, X, Y. Z
W, Y, Z
Y, Z
Z

————————————————————————
答案:(B)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

下面哪个是完全而准确的序列,雌性植物由W male授粉?
找需要由某种male授粉的条件,
由条件1、2知,S,T female均不能由 W male 授粉,其余均可,选择B。

If the grower decides not to use Z male plants, which


of the following is a possible pollination pairing?
Female male
S W
T Y
X T
Z T
Z Y

————————————————————————
答案:(E)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

如果花匠决定不用Z male,下面哪个是可能的授粉对?
解题步骤:
  1、找涉及Z male的授粉条件,
条件2:T—Z,故T female无法授粉,B错。
条件4:Z—T→X—Z,故不可能是Z-T授粉对,D错
2、由S—S得,A错。
由条件3,Z—~TX得,C错
所以选择E

If the grower decides to use neither the male nor the female plants of the S and Z strains,which
of the following is true concerning the remaining plants available to the grower?
The T males cannot be used for pollination of any of the remaining females.
The W males cannot be used for pollination of any of the remaining females.
The T females cannot be selected for pollination by any of the remaining males.
The W females cannot be selected for pollination by any of the remaining males.
The Y females cannot be selected for pollination by any of the remaining males.

————————————————————————
答案:(C)
读题:一个花匠从雄性植物中选择给雌性植物授粉,有6种植物S、T、W、X、Y、Z,雄性
和雌性都有,一个授粉组包含2个植物,一个雄性,一个雌性
写条件:
1、S—S (S雌性只能由S雄性授粉)
2、T—Z (T雌性只能由Z雄性授粉)
3、X—~TX (X雌性不能由T或X的雄性授粉)
4、Z—T→X—Z (任何Z雌性由T雄性授粉的组中,必然有X雌性被Z雄性授粉)
注:连线—前面字母为雌性植物,后面字母为雄性植物。
 

Middletown s police currently remove an apparently abandoned car from the
streets about two months after it is reported.The police have been
unfairly criticized for allowing such cars to be vandalized during this
period. Because it is illegal for car owners to abandon cars on the street,
police need not be concerned about protecting such cars.
 

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