| It’s a classic mystery of the deep. Why
does the hammerhead shark (双髻鲨)have the bizarrely shaped head from which it gets
its name There have been a variety of suggested explanations. Some simply say that the sharks use their heads to "hammer" and pin down their favourite food. More plausibly, others have speculated that the wide lobes(圆形突出部分)of the hammerhead allow it to have longer electrorecep-tots, the organs that all sharks use to detect the electric fields produced by nearby prey. This might allow hammerheads to sense subtler electric fields from more distant prey than their narrow-headed cousins. Now it turns out that the shark’s head does indeed help it find and capture prey, but not in the way that zoologists expected. Stephen Kajlura and Kim Holland of the University of Hawaii at Manoa set out to test the conven A. the different species of sharks B. the differences between hammerhead and sandbar sharks C. how hammerhead sharks detect their prey D. special functions of the hammerhead sharks [单项选择]Why does Catherine say people themselves produce harmful vapors into the indoor air
A. People shed more than any other animal indoors. B. People do not keep their room tidy. C. People’s skin flakes are small enough to float in the air and pollute the indoor air. D. The furniture people buy is in bad quality. [填空题]Why does Brendan think he might retire early
He thinks ______ might not always sell so well. [单项选择]Why does the woman mention William ShakespeareA. He gave gifts to millions of people.B. He was a very wealthy man in his time.C. A sample of his writing is worth a lot of money.
[填空题]Why does the author think that interdisciplinary studies are important
[填空题]Why does the writer put up the above poster
He/she puts on it in order to ______.
[填空题]Why does the dog’s owner mistreat the dog
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