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In the past hundred years, the world’s attitude toward whales has changed a lot. The animals are no longer seen as frightening creatures and worldwide protection efforts have reduced whale hunting. Through careful observation, scientists have shown that whales are generally peaceful, playful creatures, and that they have a high level of intelligence.

But even now, some behaviour of whales is still a mystery. A lot of information gathered by whale researchers has raised new puzzles about the animals. Whales’ communication is particularly difficult to understand. Male humpbacks (also known as bulls) give off a sequence (一连串) of low moans(呻吟), high screams and clicking noises. These noises are sometimes combined in songs that last as long as 30 minutes. And in a particular region, every male will sing the same song, making small changes every once in a while so that it evolves (逐渐形成) into a completely different song over time.

This behavior seems to be related to reproduction. During the mating (交配) season, a male humpback starts the long song sequence, stopping only to join a passing female whale (also known as a cow). Eventually, the bull and the cow may dive deep into the ocean, probably to mate. Male humpbacks’ songs are similar to what birds display to attract mates (配偶), except that the sound carries over many miles, attracting some other male humpbacks in the area. It’s very odd that a male would call his own competition to him, unless he actually wanted to test his strength against others. Some whale researchers believe that the songs are actually acoustic (听觉的) contests of strength.

1.What can we infer from the first paragraph?

A. We used to have wrong ideas about whales.

B. Whales are in danger of dying out today.

C. Whales have always been considered as fierce creatures.

D. Whales are only protected in some parts of the world.

2.We can learn from the second paragraph that      .

A. male whales and female whales both sing songs

B. people can’t fully understand whales’ communication

C. people only understand the songs of male whales

D. the songs of male whales never change

3.The last paragraph suggests that male humpbacks sing songs most probably to      .

A. find their own family members

B. work together with others to hunt

C. compete against other male humpbacks

D. frighten away other male humpbacks

高二英语阅读理解中等难度题

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