Speaker A: I'm going to the park with some friends for a barbecue on Sunday. Would you like to join usSpeaker B: ______

A．Why not on Saturday You see, I have an important appointment on Sunday.

B．Thanks, but unfortunately I have to take my sister to the airport on Sunday.

C．That's a wonderful idea. Barbecue is one of my favorites.

D．What preparation do you expect me to do for the barbecue

尽管社会主流观点往往宣扬“做人要乐观”的信念。有些科学家还是对此持有不同观点：负面情绪也是我们与生俱来的特征。是平衡精神健康的重要一环。针对目前抗抑郁药物的使用量与日俱增的情况，很多精神病学家提出了质疑，他们认为这些药物的滥用不但带来后果严重的副作用，还打破了人类情绪的平衡。 这段文字表达的主要观点是( )。

A．应该质疑“做人要乐观”的信念

B．负面情绪对精神健康并非无益

C．使用抗抑郁药物不要过多过滥

D．平衡精神健康就不能一味乐观