A：HCl→H2
B：CＯ2→CO
C：FeCl3 → FeCl２
D：SＯ2→SO３
My grandparents are ____ ____ the country life, and they wouldn't like to live with us.
下列各组没有错别字的一项是 （ ）
对板块构造学说的理解，正确的是（ ）
Mr. King ____ (hold) a party to celebrate his mother's eightieth birthday next week, isn't he?
