填入适当的词补全对话，每空一词。

A: What's your ____, Madam?

B: I feel very weak. I can hardly do any work, Doctor.

A:____ long have you been like this?

B: Ever since last month.

A: Do you____a headache?

B: No, I ____.

A: Do you sleep well at night?

B: Yes. I sleep very well.

A: Do you often have breakfast?

B: No. I have never had breakfast, and I have____ food for lunch because I would like to be thin.

A: Oh, I see. There's not much wrong  ____ you. You have to take more food and have three meals a day. And do some sports every day. Then you will get____ soon.

相同温度下，体积均为1L的两个恒容密闭容器中发生可逆反应：A（g）+2B（g）⇌2C（g）△H=a kJ•mol^﹣1．（a＞0），实验测得起始、平衡时的有关数据如下表所示，下列叙述错误的是（　　）

用配方法解关于x的一元二次方程x²-2x-3=0时，配方后的方程可以是（   ）

受精卵最初分裂形成的细胞是球形的，而组成人体的细胞形状却多种多样．这是因为细胞发生了（  ）