慢性肾功能衰竭最常见的诱因是
A．感染
B．劳累
C．应用肾毒性药物
D．饮食中蛋白质过量
E．有效循环血量减少
参考答案：A
—Excuse me, can I use your dictionary? I forgot to bring mine here.
—___________
A．Yes, you could.
B．Go ahead, please.
C．With pleasure.
D．It doesn’t matter.
