小儿骨髓外的造血器官是（）
A.胆囊
B.肾上腺
C.淋巴管
D.肝脏
E.盲肠
参考答案：D
Liu Xiang won a gold medal for the men's 110m hurdles (跨栏) in the 2004 Athens Olympics _______. [ ]
A. successfully
B. mostly
C. hardly
D. maybe
PRPP酰胺转移酶催化（）
A.PRPP生成磷酸核糖酰胺
B.IMP合成AMP
C.IMP生成GMP
D.R-5-P生成PRPP
E.甘氨酸合成嘧啶环
