A:经济重心南移
B:市民生活丰富
C:宫廷生活奢靡
D:民族关系紧张
①加入HCl ②加入NaClO ③加入NaOH ④加入Zn ⑤加热.
The farmer is very busy because he's so _______ sheep to keep and so ______ work to do every day.