钙排泄的主要器官 ()
A.肾脏
B.肠道
C.汗液
D.唾液
E.胆道
参考答案:B
解析:钙通过肠管及肾排泄,经肾排泄的钙占体内总排钙量的20%。
Look at _____ people. _____ they are having _____ football! [ ]
A. the; What a great time; playing
B. /; What great time; playing
C. the; How great time; to play
D. a; How wonderful time; to play
地方政府债券是由地方政府发行但由中央政府负责偿还的债券,简称“地方债券”,也可以称为“地方公债”或“地方债”。( )