— Do you agree that lions and tigers ______ the cat family?

— I have no idea.

A．belong

B．are belonged to

C．are belonging to

D．belong to

( )属于焦虑的症状表现。

A．喜怒无常、紧张害怕、提心吊胆、过分担忧

B．惶恐不安、悲痛欲绝、提心吊胆，肌肉紧张

C．手心出汗、担惊受怕、无动于衷、漠不关心

D．紧张害怕、提心吊胆、过分担忧，肌肉紧张