A：
B：
C：
D：
选词填空
改进 改造 改善 改变 改良 改正
元素代号
X
Y
Z
W
原子半径/pm
160
143
70
66
主要化合价
+2
+3
+3、+5、﹣3
﹣2
下列叙述正确的是（ ）
I brush my teeth and wash my face. ____
I go to school.____
What do you do after breakfast? ____
I go to school on foot. ____
What do you do before breakfast? ____
How do you go to school? ____
I brush my teeth and wash my face. ____ I go to school.____ What do you do after breakfast? ____ I go to school on foot. ____ What do you do before breakfast? ____ How do you go to school? ____