She couldn’t help, even though she tried not to, ____ at the strange clothes her friend was wearing.

A．to laugh

B．laugh

C．laughing

D．laughed

桃仁与红花共同的功效是（）

A.活血祛瘀

B.化瘀止血

C.利尿消肿

D.润肠通便

E.止咳平喘