We would appreciate it if you could stay for lunch.— Sorry, I . I have another appointment.

下列词语中加点的字，每对读音都不相同的一项是【 】 （2分）

Now one of the hottest topics_______ people are talking about is the safety of food.

“学习的本质在于在头脑中主动形成认知结构”这一观点是心理学家（）最早提出来的。

The girl ________to figure out the boy’s attitude towards her but without success