非必需氨基酸为( )。
A．Trp、Phe B．Leu、Ile C．Thr、Val D．Lys、MetE．Glu、Asp
参考答案：E
根据物品在消费方面是否具有竞争性与( )，来对经济中的物品进行私人物品与公共物品的分类。
A．共享性
B．宏观性
C．排他性
D．战略性
Which of the following is most likely to concern an investor evaluating a corporation’s shareowner rights provisions（）
A. Shareowners may nominate board members.
B. Shares held by the founding family have supernormal voting rights.
C. To ensure accuracy, company executives tabulate and verify shareowner voting.
