胆固醇合成的限速酶是：（）
A．HMGCoA合酶
B．HMGCoA裂解酶
C．HMGCoA还原酶
D．MVA激酶
E．鲨烯还原酶
参考答案：C
-I didn’t do well in the exam yesterday. Of course I _________ for it.
-Oh, your poor thing! But I think you should learn a lesson.[ ]
A. hadn’t prepared
B. haven’t prepared
C. didn’t prepare
D. wouldn’t prepare
汽车起重机行驶时，上车操纵室可以坐人。
