It seems your tray stand has been very useful to you, but we are getting ready to leave now, and my wife needs her           back....Then I got it. I had set my trays on his wife' s orthopedic walker.

[      ]

A. bag

B. walker

C. tray

D. coat

可引起自发性骨折的药物是（）。

A.糖皮质激素

B.胰岛素

C.去甲肾上腺素

D.肾上腺素