29和前面的重复了。直接上30!~~凑个整数。 30. Fireflies' Flash May Make Them Meals Fireflies who announce their availability with lots of light also risk becoming fast food. Karen Hopkin reports. ------------ When it comes to courtship, females do favor flashier males. Just take a look at the peacock and his brilliant come-hither tailfeathers. And when it comes to fireflies, females are drawn to males whose flash is rapid and strong. But if the gals like bigger brighter displays, what keeps males from evolving a light show as luminous as a guy in a convertible with a dozen gold chains around his neck? Well, it turns out that male fireflies that are too obvious are more likely to get eaten. Or so say scientists at Tufts University, in the November issue of American Naturalist. To determine why fireflies don’t go all out when it comes to illumination, the Tufts team set out to uncover the hidden costs of producing light. They found that flashing doesn’t put much of a strain on a firefly’s energy reserves. So it’s not that they’re trying to avoid burn-out—they’re trying to avoid becoming take-out. Because bugs who flash too fast tend to attract more than the light-of-their-lives. They attract predatory fireflies looking for a snack. And, sad to say, their last thoughts probably are something like, “Look at me! Look at me! Look at me! [CHOMP] Look at…” -- by 会员 ashlie888 (2011/11/11 23:04:46)
今天听了这篇.觉得有点难的.听完2遍的时候,只听出讲和flash和光有关的内容.
这句没有听出来(what keeps males from evolving a lightshow as luminous as a guy in a convertible with a dozen gold chains around his neck? )
gal: a girl or young woman take-out: food that is cooked and sold by a restaurant orstore to be eaten elsewhere
还有,文章有一个小错误. 原文:And when it comes to fireflies, females are drawn to males whose flash is rapid and strong. 实际:And when the suitors are fireflies, it turns out females are drawn...
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