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31-13: Dolphins lack vocal cords, nevertheless creating sounds: a complicated system of whistles, Squeaks, moans, trills, and clicks are produced by sphincter muscles inside the blowhole.
A: nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by
B: nevertheless creating sounds: they produce a complicated system of whistles, squeaks, moans, trills, and clicks with
C: but they do create sounds, producing a complicated system of whistles, squeaks, moans, trills, and clicks being produced
D: but they do create sounds, a complicated system of whistles, squeaks, moans, trills, and clicks being produced
E: but nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks produced by
我觉得B中的they 不对,they 是指代Dolphins,D能发展这个系统吗?我觉得应该是使用,就好象说人produce 了一个呼吸系统一样,感觉有些不对。其实我也不是很喜欢D,不喜欢里面的being produced,但觉得其他的更不对,所以只能选了这个,你的意见呢? |