某实验需要500ml 0.4mol/L的NaOH溶液，配制该溶液时，用托盘天平称取NaOH固体的质量（　　）

A．等于8.0g

B．等于8.00g

C．等于8g

D．等于0.2g

根据句意和首字母提示补全所缺单词。

小题1:We  like  to  p________ football.

小题2:I f____________ in love with the city some years ago.

小题3:I don’t like doing housework, I think it is a b_________ job.

小题4:what’s the m__________?  I have a cold.