作者charite (单纯。喜欢)
看板IELTS
标题[问题] evolution of insect flight
时间Sat Jan 23 19:23:37 2010
这段话
The study of insect is hampered by a gigantic gap in the fossil record.
Although fossils of early nonflying insects have been found in sediments
dating from the Devonian period nearly 400 million years ago, no insect
^^^^^^^^^^
fossils have turn up from the following 75-million-year period.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
问题为
How wide is the fossil gap?
答案为什麽是^^^说的75-million-year呢
谢谢
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◆ From: 114.38.103.8
※ 编辑: charite 来自: 114.38.103.8 (01/23 20:13)
1F：推 suzyn:400万年前 有发现不具飞行能力的昆虫化石 但在皆下来的75 01/23 20:29
2F：→ suzyn:百万年 都没有发现昆虫化石 所以间隔是75百万年没错 01/23 20:31
3F：→ charite:谢谢 01/23 20:46