通货膨胀对经济的影响是( )。
A．改变了原有收入和财富占有的比例B．使投资项目的吸收力下降C．国际市场需求不足D．使实际利率上升
参考答案：A
— No, I'm afraid he isn't in. This is his secretary speaking. Can I help you?
— _____.[ ]
A. Oh, you will.
B. Oh, that's a pity.
C. I should think so.
D. Well, I look forward to hearing from you.
青贮厌氧发酵过程的3个时期是（）。
A.植物呼吸期
B.好氧性微生物繁殖期
C.盐化处理期
D.乳酸发酵期
