细菌合成细胞组分和获得能量的基质主要是（）
A.蛋白质
B.淀粉
C.脂类
D.糖类
E.糖原
参考答案：D
After hospitals buy expensive equipment,they must try to __________ the money they had spent.
A．recover
B．reduce
C．remove
D．receive
创造性行为的类型有哪些?
