以下哪项不是肝素的作用（）。

A.抗凝血

B.抑制血小板

C.调血脂

D.抗过敏

E.解热镇痛

The Nile River ____ flood large areas but now the water ____ produce electricity. [ ]

A. used to; is used to

B. used to; used to

C. was used to; is used to

D. was used to; used to