網(wǎng)校老師么教授09年職稱英語押中題目之理工類A級
第二篇 Listening to Birdsong
A male zebra finch chirps away to himself. Suddenly he notices a female bird, nearby: He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance? According to a new study, the female zebra finch knows. And she prefers the special trills he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference.
Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female ( and potential mate) nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used.
For this Study, researchers Sarah C. Woolley and Allison Doupe at the University of California, San Francisco decided to focus attention on the listening females, which have not been
well studied in the past.
In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert.
Female birds were placed between the two speakers. Some of the birds had mates, others didn’t. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they’d never met the male.
Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening, to the concert version of their mates’ songs. This suggests that after a while, females learn to recognize--and prefer―the songs of their mates.
Scientists then studied the brains of the females. They found certain areas of the brain perked up when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them.
This research deals with what’s called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way moms speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter, and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.
36. What does the first paragraph say about zebra finches?
A Male zebra finches like to sing to female zebra finches.
B Male zebra finches sing louder than female zebra finches.
C Male zebra finches change their songs in female zebra finches’ presence.
D Male zebra finches like to listen to female zebra finches sing.
37. What did the researchers find in their study of female zebra finches?
A Female finches liked songs male finches sang for them.
B Female finches only liked songs male finches sang for their mates.
C Female finches liked to listen to songs from both speakers.
D Female finches chose the best male singers as their mates.
38. What is meant by "concert songs" in the seventh paragraph?
A Songs sung by zebra finches at a concert.
B Songs sung by male finches for female finches.
C Songs sung by female finches for male finches.
D Songs sung by male finches to many female finches.
39. What is NOT tree of directed communication?
A The sender of a message has a specific audience.
B Male zebra finches sing to female finches.
C Mothers talk to their babies.
D Male zebra finches sing to themselves.
40. Which of the following can best reflect the theme of the passage?
A Chirping away.
B Birdsongs as communication.
C Zebra finches and their life.
D Enjoying birdsongs.
Sharks Perform a Service for Earth’s Waters
It is hard to get people to think of sharks as anything but a deadly enemy. They are thought to _____51 people frequently. But these fish perform a_____ 52 service for earth’s waters and for human beings. Yet business and sport fishing are threatening their _____53 Some sharks are at risk of disappearing from_____ 54 .
Warm weather may influence both fish and shark activity. Many fish swim near coastal areas _____55 their warm waters. Experts say sharks may follow the fish into the same areas, _____56 people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person _____57 a sea animal, such as a seal or sea lion. That is why people should not swim in the ocean when the sun goes down or comes up. Those are the _____58 when sharks are looking for food. Experts also say that bright colors and shiny jewelry may cause sharks to attack.
A shark has an extremely good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and _____59 produced by animals. These powerful _____60 help sharks find their food. Sharks eat fish, any _____61 sharks, and plants that live in the ocean.
Medical researchers want to learn more about the shark’s body defense and immune _____62 against disease. Researchers know that sharks _____63 quickly from injuries. They study the shark in hopes of finding a way to fight human disease.
Sharks are important for the world’s _____64 . They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too _____65 This protects the plants and other forms of life that exist in the oceans.
練習(xí):
51. A attack B meet C love D visit
52. A terrible B eatable C valuable D possible
53. A source B existence C friends D fish
54. A Space B Sky C Land D Earth
55. A because B since C because of D by reason that
56. A whose B which C that D where
57. A to B for C like D with
58. A times B places C seas D oceans
59. A sciences B mathematics C chemicals D physics
60. A feelings B senses C touches D tastes
61. A those B these C another D other
62. A systems B processes C ideas D circles
63. A recover B reform C return D rely
64. A rivers B oceans C forests D mountains
55. A weak B little C few D great
答案:ACBDC DBACB DAABD
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