下列有机物的命名正确的是 [ ]
A．二溴乙烷
B．3 -乙基-1 -丁烯
C．2 -甲基-2，4-己二烯
D．2，2，3-三甲基戊烷
答案：C
I think the girl under the tree must be Lily.
No, it ______be her. She is in the library now.
A．must
B．may
C．can’t
D．could
农业创新扩散的过程？
