桑叶的功效是( )
A.《神农本草经》 B.《本草经集注》 C.《唐本草》 D.《证类本草》 E.《本草纲目》
参考答案:D
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