[单项选择]For over 30 years, Donald Kroodsma has worked to disclose such mysteries of bird communication. Through field studies and laboratory experiments, he’s studied the ecological and social forces that may have contributed to the evolution of vocal learning. Kroodsma has paid particular attention to local variation in song types, known as dialects. The Black-capped Chickadees (Parus atricapillus)on Martha’s Vineyard, for example, have an entirely different song than their counterparts on the Massachusetts mainland, he says. Birds that live on the boundary between two dialects or that spend time in different areas can become "bilingual," learning the; songs of more than one group of neighbors. Recently, Kroodsma discovered that the Three-wattled Bellbird (Procnias tricarunculata) is constantly changing its song, creating what he calls a "rapid cultural evolution within each generation. "This kind of song evolution is found in whales but, up until now, rarely in birds.
A professor of bio
A. I and II
B. II and III
C. I and III
D. III only

[单项选择]For over 30 years, Donald Kroodsma has worked to disclose such mysteries of bird communication. Through field studies and laboratory experiments, he’s studied the ecological and social forces that may have contributed to the evolution of vocal learning. Kroodsma has paid particular attention to local variation in song types, known as dialects. The Black-capped Chickadees (Parus atricapillus)on Martha’s Vineyard, for example, have an entirely different song than their counterparts on the Massachusetts mainland, he says. Birds that live on the boundary between two dialects or that spend time in different areas can become "bilingual," learning the; songs of more than one group of neighbors. Recently, Kroodsma discovered that the Three-wattled Bellbird (Procnias tricarunculata) is constantly changing its song, creating what he calls a "rapid cultural evolution within each generation. "This kind of song evolution is found in whales but, up until now, rarely in birds.
A professor of bio
A. I and II
B. II and III
C. I and III
D. III only

[单项选择]Passage Three

Who is Donald Kroodsma a. The author of the book called The Singing Life of Birds. b. The scientist of a program called The Singing Life of Birds. c. The author of the magazine called The Singing Life of Birds. d. The professor of a University studying The Singing Life of Birds.

[单项选择]Over the last 40 years there has been a great increase not only in the number of agricultural pesticides in use but also in the care and sophistication with which they are used by farmers. Nevertheless, the proportion of agricultural crops lost to certain pests worldwide has increased over the same period, even when the pests concerned have not developed resistance to existing pesticides.
Which of the following, if true, best explains how improvements in pesticide use have been accompanied by greater losses to certain pests
A. Some dangerous but relatively ineffective pesticides common 40 years ago are no longer in widespread use.
B. As pesticides have become increasingly pest-specific, controlling certain pests with pesticides has turned out to cost more in many cases than the value of crop losses caused by those pests.
C. Because today’s pesticides typically have more specific application conditions than did pesticides in use 40 years ago, today’s farmers observe their fields more closely than did farmers 40 years ago.
D. Certain pest-control methods that some farmers use today do not involve the use of chemical pesticides but are just as effective in eliminating insect pests as those that do.
E. (E) Forty years ago, much less was known about the effects of pesticides on humans and other mammalian species than is now known.

[判断题]

Mr. Hooper has worked hard and has been very loyal to the company.

[单项选择]

How many years has Ms. Mann worked for the BBC
A. Five.
B. Fifteen.
C. Four
D. Fourteen.

[单项选择]