在氮质血症期,应开始给予低磷饮食,每日不超过()
A.600mg
B.700mg
C.800mg
D.900mg
E.1000mg
参考答案:A
—I feel very happy that I _____ to be the host.
-Congratulations! [ ]
A. choose
B. am chosen
C. was chosen
D. have chosen
绿色食品生产最重要的介质是什么?