________ difficult the situation is, we'll help one another to overcome it. [      ]

A. Whatever

B. Whenever

C. Wherever

D. However

桑白皮与葶苈子都既能泻肺平喘，又能（）

A.利水渗湿

B.利水通淋

C.利水消肿

D.利水止泻

E.利水退黄