是合成酮体的关键酶
A．乙酰乙酸硫激酶B．HMG-CoA裂解酶C．HMG-CoA合成酶D．乙酰CoA羧化酶
参考答案：B
Look, the man with his friends ________ at the pool.[ ]
A. swim
B. swims
C. is swimming
D. are swimming
按发行本位分类，国债可分为（）。
Ⅰ.实物国债
Ⅱ.货币国债
Ⅲ.建设国债
Ⅳ.赤字国债
A.Ⅰ、Ⅱ
B.Ⅲ、Ⅳ
C.Ⅰ、Ⅲ
D.Ⅱ、Ⅳ
