汽油质量不好表现:求语法题

来源:百度文库 编辑:神马品牌网 时间:2024/05/08 16:15:42
a proton has a positive charge and an electron a negative charge, but a neutron has
a neither b both
答案选a
WHY?

质子带正电,电子带负电,中子不带电(正负电都不带).
Neither就是都不的意思,所以选A

I think so.