11.All of the following are given as characteristics of collectible objects EXCEPT
durability
portability
value
scarcity.
12.According to the passage,all of the following are factors that make people want to touch beads1 EXCEPT the
shape
color
material
odor
13.The word unravelin line 16is closest in meaning to
communicate
transport
improve
discover
14.The word mundanein line 16is closest in meaning to
carved
beautiful
ordinary
heavy
15.It is difficult to trace the history of certain ancient beads because they
are small in size
have been buried underground
have been moved from their original locations
are frequently lost
16.Knowledge of the history of some beads may be useful in the studies done by which of the following?
Anthropologists
Agricultural experts
Medical researchers
Economists
17.Where in the passage does the author describe why the appearance of beads may change?
Lines 3-4
Lines 6-8
Lines 12-13
Lines 20-22
Question 18-31
In the world of birds,bill design is a prime example of evolutionary2 fine-tuning.Shorebirds such as oystercatchers use their bills to pry3 open the tightly sealed shells of their prey,hummingbirds have stiletto-like bills to probe the deepest nectar-bearing flowers,and kiwis smell out earthworms thanks to nostrils4 located at the tip of their beaks6.But few birds are more intimately tied to their source of sustenance7 than are crossbills.Two species of these finches,named for the way the upper and lower parts of their bills cross,rather than meet in the middle,reside in the evergreen8 forests of North America and feed on the seeds held within the cones10 of coniferous trees.
The efficiency of the bill is evident when a crossbill locates a cone9.Using a lateral11 motion of its lower mandible,the bird separates two overlapping12 scales on the cone and exposes the seed.The crossed mandibles enable the bird to exert a powerful biting force at the bill tips,which is critical for maneuvering13 them between the scales and spreading the scales apart.Next,the crossbill snakes its long tongue into the gap and draws out the seed.Using the combined action of the bill and tongue,the bird cracks open and discards the woody seed covering action and swallows the nutritious14 inner kernel15.This whole process takes but a few seconds and is repeated hundreds of times a day.
The bills of different crossbill species and subspecies vary -some are stout16 and deep,others more slander17 and shallow.As a rule,large-billed crossbills are better at securing seeds from large cones,while small-billed crossbills are more deft18 at removing the seeds from small,thin-scaled cones.Moreover,the degree to which cones are naturally slightly open or tightly closed helps determine which bill design is the best.
One anomaly is the subspecies of red crossbill known as the Newfoundland crossbill.This bird has a large,robust bill,yet most of Newfoundland's conifers have small cones,the same kind of cones that the slender-billed white-wings rely on.
18.What does the passage mainly discuss?
The importance of conifers in evergreen forests
The efficiency of the bill of the crossbill
The variety of food available in a forest
The different techniques birds use to obtain food
19.Which of the following statements best represents the type of evolutionary fine -turningmentioned in line1?
Different shapes of bills have evolved depending on the available food supply
White -wing crossbills have evolved from red crossbills
Newfoundland's conifers have evolved small cones
Several subspecies of crossbills have evolved from two species
20.Why does the author mention oystercatchers,hummingbirds,and kiwis in lines 2-4?
They are examples of birds that live in the forest
Their beaks are similar to the beak5 of the crossbill
They illustrate19 the relationship between bill design and food supply
They are closely related to the crossbill
21.Crossbills are a type of
shorebird
hummingbird
kiwi
finch
22.Which of the following most closely re百度竞价推广bles the bird described in lines 6-8?
（图）
（图）
（图）
（图）
23.The word whichin line 12refers to
seed
bird
force
bill
Question 18-31
In the world of birds,bill design is a prime example of evolutionary fine-tuning.Shorebirds such as oystercatchers use their bills to pry open the tightly sealed shells of their prey,hummingbirds have stiletto-like bills to probe the deepest nectar-bearing flowers,and kiwis smell out earthworms thanks to nostrils located at the tip of their beaks.But few birds are more intimately tied to their source of sustenance than are crossbills.Two species of these finches,named for the way the upper and lower parts of their bills cross,rather than meet in the middle,reside in the evergreen forests of North America and feed on the seeds held within the cones of coniferous trees.
The efficiency of the bill is evident when a crossbill locates a cone.Using a lateral motion of its lower mandible,the bird separates two overlapping scales on the cone and exposes the seed.The crossed mandibles enable the bird to exert a powerful biting force at the bill tips,which is critical for maneuvering them between the scales and spreading the scales apart.Next,the crossbill snakes its long tongue into the gap and draws out the seed.Using the combined action of the bill and tongue,the bird cracks open and discards the woody seed covering action and swallows the nutritious inner kernel.This whole process takes but a few seconds and is repeated hundreds of times a day.
The bills of different crossbill species and subspecies vary -some are stout and deep,others more slander and shallow.As a rule,large-billed crossbills are better at securing seeds from large cones,while small-billed crossbills are more deft at removing the seeds from small,thin-scaled cones.Moreover,the degree to which cones are naturally slightly open or tightly closed helps determine which bill design is the best.
One anomaly is the subspecies of red crossbill known as the Newfoundland crossbill.This bird has a large,robust bill,yet most of Newfoundland's conifers have small cones,the same kind of cones that the slender-billed white-wings rely on.
18.What does the passage mainly discuss?
The importance of conifers in evergreen forests
The efficiency of the bill of the crossbill
The variety of food available in a forest
The different techniques birds use to obtain food
19.Which of the following statements best represents the type of evolutionary fine -turningmentioned in line1?
Different shapes of bills have evolved depending on the available food supply
White -wing crossbills have evolved from red crossbills
Newfoundland's conifers have evolved small cones
Several subspecies of crossbills have evolved from two species
20.Why does the author mention oystercatchers,hummingbirds,and kiwis in lines 2-4?
They are examples of birds that live in the forest
Their beaks are similar to the beak of the crossbill
They illustrate the relationship between bill design and food supply
They are closely related to the crossbill
21.Crossbills are a type of
shorebird
hummingbird
kiwi
finch
22.Which of the following most closely re百度竞价推广bles the bird described in lines 6-8?
（图）
（图）
（图）
（图）
23.The word whichin line 12refers to
seed
bird
force
bill