合成胆固醇的限速酶是()
A.羟甲基戊二酰辅酶A还原酶(HMGCoA还原酶)
B.脂蛋白脂肪酶
C.肝脂酶
D.卵磷脂胆固醇酯转移酶
E.鲨烯环氧酶
参考答案:A
— _____ your friend play the guitar?
— Yes, he can, but he can't play it well. [ ]
A. Must
B. Can
C. Should
D. Need
试述发展性教学评价的基本理念和特征。