As we all know，tigers and cats________the same family of beasts.

A．belonged to

B．are belonged to

C．belong to

D．are belonging to

对鉴别感染性心内膜炎和风湿活动最有帮助的选项是（）

A.进行性贫血

B.多汗

C.血沉增快

D.皮肤黏膜瘀点

E.发热