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5月托福閱讀全真試題
在平平淡淡的日常中，我們經(jīng)常接觸到試題，試題是命題者根據(jù)一定的考核需要編寫出來(lái)的。你知道什么樣的試題才是好試題嗎？下面是小編為大家整理的5月托福閱讀全真試題，歡迎大家分享。
5月托福閱讀全真試題 1
Orchids are unique in having the most highly developed
of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column.
The column is designed so that a single pollination will fertilize hundreds of thousands, and in some cases millions, of seeds,so microscopic and light they are easily carried by the breeze.
Surrounding the column are three sepals and three petals,sometimes easily recognizable as such, often distorted into gorgeous,weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator.
To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family,each blended to attract one, or at most a few, species of insects or birds. Some orchids even change their scents to interest different insects at different times.
Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed.
By such ingenious adaptations to specific pollinators,orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities.
At the same time they have made themselves irresistible to collectors.
1.What does the passage mainly discuss?
(A) Birds
(B) Insects
(C) Flowers
(D) Perfume
2.The orchid is unique because of
(A) the habitat in which it lives
(B) the structure of its blossom
(C) the variety of products than can be made from it
(D) the length of its life
5月托福閱讀全真試題 2
if the salinity of ocean waters is analyzed， it is found to vary only slightly from place to place. nevertheless， some of these small changes are important. there are three basic processes that cause a change in oceanic salinity. one of these is the subtraction of water from the ocean by means of evaporation conversion of liquid water to water vapor. in this manner， the salinity is increased， since the salts stay behind. if this is carried to the extreme， of course， white crystals of salt would be left behind.
the opposite of evaporation is precipitation， such as rain， by which water is added to the ocean. here the ocean is being diluted so that the salinity is decreased. this may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. thus salinity may be increased by the subtraction of water by evaporation， or decreased by the addition of fresh water by precipitation or runoff.
normally， in tropical regions where the sun is very strong， the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. similarly， in coastal regions where rivers dilute the sea， salinity is somewhat lower than in other oceanic areas.
a third process by which salinity may be altered is associated with the formation and melting of sea ice. when seawater is frozen， the dissolved materials are left behind. in this manner， seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. of course， when this ice melts， it will tend to decrease the salinity of the surrounding water.
in the weddell sea， off antarctica， the densest water in the oceans is formed as a result of this freezing process， which increases the salinity of cold water. this heavy water sinks and is found in the deeper portions of the oceans of the world.
1. What does the passage mainly discuss？
A.the elements of salt
B.the bodies of water of the world
C.the many forms of ocean life
D.the salinity of ocean water
2. The word this in line 5 refers to
A.ocean
B.evaporation
C.salinity
D.crystals
3. According to the passage， the ocean generally has more salt in
A.coastal areas
B.tropical areas
C.rainy areas
D.turbulent areas
4. All of the following are processes that decrease salinity except
A.evaporation
B.precipitation
C.runoff
D.melting
5. Which of the following statements about the salinity of a body water can best be
inferred from the passage？
A.the temperature of the water is the most important factor.
B.the speed with which water moves is directly related to the amount of salt.
C.ocean salinity has little effect on sea life.
D.various factors combine to cause variations in the salt content of water.
6. The word altered in line 16 is closest in meaning to
A.determined
B.changed
C.accumulated
D.needed
7. The world it in line 18 refers to
A.sea ice
B.salinity
C.seawater
D.manner
8. Why does the author mention the weddell sea？
A.to show that this body of water has salinity variations
B.to compare antarctic waters with arctic waters
C.to give an example of increased salinity due to freezing
D.to point out the location of deep waters
9. Which of the following is not a result of the formation of ocean ice？
A.the salt remains in the water.
B.the surrounding water sinks.
C.water salinity decreases.
D.the water becomes denser.
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