—Is this ________ ruler?　—Yes，it’s her ruler．（）
 

下列有关NaOH的实验方案中，正确的是（  ）

已知某次月考的数学考试成绩$\xi \sim N\left(90,{\sigma }^2\right)\left(\sigma >0\right)$,统计结果显示$p\left(70\le \xi \le 110\right)=0.6$，则$p\left(\xi <70\right)=$(    )

M: Are you free o____ Sunday/

W: No, I'm very b____. At 8:30 I have a music lesson. Then at 10:00 I have English. It is useful (有用的)but it is d____ for me.

M: Well, what time do you have l____.

W: At 12：00.

M: What lessons do you have in the a____.

W: I have a Chinese lesson and an A____ lesson.

M: W____ is your Chinese teacher?

W: Ms. Yang.

M: And what time do your lessons finish?

W: At h____ past four.

M: What do you do in the evening?

W: I l____ to music. What about you?

M: I usually watch TV after d____.