阻止微管解聚的抗癌药有（）
A.紫杉醇
B.长春碱
C.紫杉碱
D.L-门冬酰胺酶
E.喜树碱
参考答案：A, C
用所给饲的适当形式填空。
1. I'd like some coffee, but he likes _______ (drink)green tea.
2. Do you like American food or _______ (China) food?
3. Orange juice is a kind of _______, and Mary often ______ (drink) it.
4. A bowl of potatoes _______ (be) on the table.
早期的期货市场对于需求方来讲，起到了（）的作用。
A.稳定货源
B.锁住生产成本
C.稳定产销
D.锁住经营成本
E.获得风险利润
