Did you ______ ice cream yesterday? [ ]
A. eat
B. ate
C. eating
答案：A
—The medicine tastes so bad!
—It surely does. But it will ______ you good. [ ]
A. give
B. want
C. help
D. do
下列关于酶性质、功能的叙述，正确的是
A．生物体内的无机催化剂
B．催化活性都需要特异的辅酶
C．对底物都有绝对专一性
D．能显著地降低反应活化能
E．在体内发挥催化作用时，不受任何调控
