题干
对下列化学用语中数字“2”的说法正确的是（ ）
①2H ②2NH3③SO2④O2⑤Mg2+⑥2OH﹣⑦H2O．
A：表示离子个数的是⑤⑥
B：表示离子所带电荷数的是④⑤
C：表示分子中原子个数的是③⑦
D：无选项
答案(点此获取答案解析）
D
at 6:30 in the morning. I 
at home. Then I 
at 7:10. I
at 7:30. I 
at 11:45. In the afternoon, we 
class. After school, I 
with my friends. In the evening, I 
or 
. I
at 9:00. This is my day.