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A．Many species have developed a habit of migration.
B．Many species have become less sensitive to climate.
C．Many new species have come into existence.
D．Many species have moved further north.
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更多“A．Many species have developed a habit of migration.B．Many species have become less sen”相关的问题
第1题
The smallest bat in the world is from Southeast Asia.This kind of bat measures about 30 millimeters in length. The world's largest bat, the Giant Golden-Crowned Flying Fox, has a wingspan of 1.5 meters.Most bats eat insects,but many feed on fruit or nectar from flowers.
Many people think bats are blind,but this is not true.Many species have very good sight.Most bats communicate and find their way by making"echolocation" (回声定位法 ) noises.They produce high-frequency noises and can estimate the distance of an object by using the sound echoes that bounce back to them. So, while bats may travel in total darkness, they"see"using sound.
Sadly, bats are widely feared and misunderstood. Most bats come out of their shelters only at nightfall. Three bat species feed on blood. Because of these qualities, bats have long been linked in many cultures to death, darkness and blood-drinking.
Yet bats are important for agriculture and our environment. They help pollinate (授粉)plants and spread seeds. They also help control insects. Bats eat huge numbers of insects,including kinds that damage crops.
For example, a brown bat can eat more than 1,000 insects in one hour.Onereport says bats save American farmers billions of dollars every year by reducing crop damage and limiting the need for chemicals that kill insects.
Over one-fifth of all bat species are under threat. They face disease and the human destruction of their natural environments.In some areas, diseases have killed nearly 100% of bat populations.
第21题 The United Nations declared 2011 to 2012 the Year of the Bat,because bats_____.
A.are beneficial animals B.are close to extinction
C.have been misunderstood D.are under serious threat
第22题 Bats can fly in total darkness, because_____.
A.their eye sight is extremely sharp
B.they can fly without using their sight
C.they don't have eye sight in daytime
D.they are very familiar with their environment
第23题 Many people fear bats because_____.
A.many cultures connect bats with unpleasant things
B.bats are very ugly in appearance
C.bats are thought to be blind
D.bats carry deadly diseases with them
第24题 It can be concluded that_____.
A.bats are more easily to be killed by diseases
B.bat population has been reduced sharply these days
C.bats can help farmers save crops and money
D.bats' living environment has been mostly destroyed
第25题 The word" nectar" in the second paragraph probably means_____.
A.the flowers' eyes B.the flowers' leaves
C.the smell produced by flowers D.the liquid produced by flowers
第2题
A．Many of them work full-time.
B．They usually arrive on file weekend.
C．They have volunteered for the orientation.
D．They will need new textbooks.
第3题
A．Many sources of surface water have been found.
B．Chemicals were found in the water.
C．A growing population need more clean water in that place.
D．A bomb factory will be built there.
第4题
A．Many people have quit their old houses to build new ones.
B．Many older people sell their houses after their children leave.
C．Many old houses in the bad part of the town are not inhabited.
D．Many young people have moved into comfortable apartments.
第5题
A．Many programs are provided.
B．It is difficult to get in.
C．Students' fees are rather high.
D．Students have many chances to go abroad.
第6题
The reason why CASA tries to "renew the trust" (last paragraph) may be that ______.
A．many attorneys and social workers have cheated in the children's cases
B．CASA has good reputation so that they can earn trust very easily
C．these children's misfortunes have made it difficult for them to trust anyone or anything again
D．they have done many successful cases
第7题
What do we learn from Mortimer Zuckerman's lamentation？
A．Many middle-income families have failed to make a bargain for better welfare.
B．The American economic system has caused many companies to go bankrupt.
C．The American nation is becoming more and more divided despite its wealth.
D．The majority of Americans benefit little from the nation's growing wealth.
第8题
A．Many students find Prof. Johnson's lectures boring.
B．Few students understand Prof. Johnson's lectures.
C．Many students have dropped Prof. Johnson's class.
D．Few students meet Prof. Jonson's requirements.
第9题
Change blindness refers to the phenomenon that ______.
A．many people fail to notice the big change around them
B．people tend to ignore the small changes in the surroundings
C．people's choices can be easily interrupted by a big change
D．quite a few people do not have a good sense of directions
第10题
Which factor pushed up house prices？
A．Many young men, who live alone, have increased demand for houses.
B．Many young men need to rent more houses.
C．It is easy to apply for a mortgage for young generation.
D．The number of older people, many of whom live alone, becomes bigger and bigger.
