语法问题~~

baby11

1.   The <system>of chemical symbols ,first devised about 1800,gives a

concise and <instantly >recognizable description of <a >element <or

>conpound.

我的答案是c但答案是b??


2.Usually an atom< having >one ,two, or three electrons in <its >valence band <readily> contributes electrons to and receiee electrons from <neighboring atoms.>

answer is b,why?

himba

第一题选c，答案错了
第二题b是对的，its指代前面的atom，倒是这句话我觉有问题，and后面应该改成not receives
个人观点