只用一本书提高英语听力能力!重温经典名著双语阅读小编推荐:跟着纪录片学英语不背单词和语法,轻松学英语
返回列表 回复 发帖

[科学美国人60秒] 【整理】SSS 2009-08-24

提高英语听力能力 找对方法很重要!
HW

This is Scientific American’s 60 Second Science. I’m Steve Mirsky. Got a minute?

Two years ago, the Duke University medical center researchers said that the supposedly useless appendix is actually where good gut bacteria safely hide out during some unpleasant intestinal conditions. Now the research team has looked at the appendix over evolutionary history. They found animals have had appendixes for about 80 million years. And the organ has evolved separately at least twice: once among the weird Australian * and another time in the irregular mammal lineage that we belonged to.

Darwin thought that only a few animals had appendix and that the human version was what was left of digest organ called the caecum. But the new study found that 70 percent of rotten to primary groups have species with appendix, and some living animals have the caecum and the appendix. If Darwin had known about the species that have both organs, he probably would revise his views of the appendix the researchers note.

Ironically, it’s natural selection that keeps the human appendix from shrinking away completely because smaller ones are more likely to become affected and keep your genes out of the pool.

Thanks for the minute for the Scientific American’s 60 Second Science. I’m Steve Mirsky.
1

评分次数

  • yrml

I love pressure~
返回列表