求解:select a book you have read and write a report of about 300-400 words.

问题描述:

求解:select a book you have read and write a report of about 300-400 words.
在这句话中,of 和about两个介词放在一起使用,不是很明白.感觉of 应该是多余了,是不是印刷问题?还是什么英语理论?求解!

...a report of (about)300-400 words (大约)三四百字的报告
about这里是adv.副词,表 “大约”