语法有题大概记得说尽管有很多流星雨之类的,但是大气保护了人类,作为一个shield。但是两个答案之间纠结了很久。 Though 什么流星雨之类,______ a shield, at least protect XXX. c) for some places atmosphere protects human ... and acts as, e) human beings for some places have been protected by atmosphere, which acts as 其他明显错。