烤烟在醇化过程中，氨基酸均呈（）的趋势。
A.增加
B.减少
C.不变
D.以上都有可能
参考答案：B
以下哪点不是微波通信所具有的特点？（）
A.频带宽
B.通信容量大
C.传输损伤大
D.抗干扰能力强
—It's a fine day today. Shall we go swimming?
—_______ But we need to be home before six o'clock. [ ]
A. Have a nice time!
B. Not at all.
C. You are right.
D. Good idea!
