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Feathers are not just for flight. They k...

Feathers are not just for flight. They keep birds warm, and attract mates. And for one Australian bird, feathers even help produce an important sound—an alarm.

“People had long noticed these birds produced these loud sounds.” Trevor Murray, a researcher at the Australian National University said. “My supervisor Rob Magrath and May Hingee thought they were used as an alarm. So they did some playbacks and they could show quite strongly that if you play back these sounds to other birds, they flee straightaway. So I was really interested in how they produce the sound, whether it is actually a signal, and whether it’s a reliable signal.”

The team focused their experiment on specific feathers in the pigeon’s wing. “We were able to target the eighth primary feather, which is unusually narrow. And then we also removed, on different sets of birds, those neighboring feathers, the ninth primary feather and the seventh primary feather. And we were able to see when the eighth primary feather was missing, the high note had completely disappeared. So the eighth primary feather produced that high note and the ninth primary feather actually produced the low note.”

And if the birds are fleeing from danger, they produce a louder and higher sound than they do during a normal takeoff. The study is in the journal Current Biology.

Murray and his colleagues did another experiment where they used the recordings they made to observe the reactions of other pigeons. “We were able to see the unusual eighth primary feather was important for signaling the alarm. When that eighth primary feather was missing, they very rarely responded. They almost never fled. Whereas when the ninth primary produces the sound, they fled just as much as to normal alarms. This shows us this unusual primary feather is important for signaling alarm.”

That makes birds of a feather flee together.

1.What does the underlined word “they” in Paragraph 2 refer to?

A. The birds    B. Rob and May

C. The feathers    D. The loud sounds

2.What did Rob Magrath and May Hingee find out about the birds?

A. They fly away as a group.    B. They produce different notes.

C. They send alarms with feathers.    D. They attract mates with feathers.

3.Why did the team remove different feathers?

A. To record the notes they produce.    B. To keep the pigeons stay in cages

C. To compare their width and length.    D. To observe other pigeons’ reactions.

4.According to Murray and his colleagues, why does the unusual feathers matter most?

A. It keeps the pigeons warm    B. It responds to alarms

C. It helps birds fly more quickly    D. It sounds alarms of danger.

 

1. B 2. C 3. A 4. D 【解析】 本文为科普类说明文。澳大利亚国立大学的几位研究人员通过研究指出,鸟类的羽毛不仅仅是用来飞行的,它们甚至能向同类发出重要的警报。 1.代词指代题。根据第上一句中My supervisor Rob Magrath and May Hingee thought they were used as an alarm.(于是他们做了一些声音的回放,并且强烈表明如果你把这些声音回放给其他鸟类听,它们就会立刻逃跑)可推知,这里they是指Rob和May,故选B。 2.推理判断题。根据文章第3,4和5段研究小组所作的实验可知,他们把实验集中在鸽子翅膀的特定羽毛上,结果发现鸽子是用羽毛发出警告的,选C。 3.细节理解题。通过第3段可知,弄掉周围的羽翼,是为了记录每根主羽翼所发出的音调。故选A。 4.细节理解题。根据第4和5两段Murray和他的同事们做的另一个实验,第8根主羽翼是发出警报声的关键,对于发出警报是非常重要的。故选D。
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