However, in ______ recent years, Niagara Falls have come to be appreciated more for their natural beauty as ______ wonder of nature.

A．不填; a

B．the; the

C．不填; the

D．the; a

中轻度糖尿患者宜选用的降糖药是（）

A.阿卡波糖

B.氯磺丙脲

C.精蛋白锌胰岛素

D.甲苯磺丁脲

E.正规胰岛素