请教大家一个关于阅读的问题

qazwsx3355

One interesting, and controversial, finding is that extingctions during the past 250 Million years have tended to be more intense every 26 million years.

According to the passage, it is believed that the largest extinction of a species occurred

A. 26 million years ago

C. 225 million years ago

我把这个句子认为成每隔26年就变得更厉害了。所以错选了A。请问一下，如果要把这个句子表达成选择A的意思的话，应该怎么写呀？

附加：作文写成多少个字比较好？对于文章的格式应该怎么写？是定格写然后段与段之间空一行，还是开头空两格段与段之间不空行？

谢谢

qazwsx3355

自己顶一个,大家帮个忙呀~帮帮忙呀。

[此贴子已经被作者于2005-9-27 5:38:00编辑过]