作授粉树必须具有的条件有：（）。
A、与主要品种花期相近
B、与主要品种同时进入结果期
C、必须是三倍体品种
D、根系比主要品种发达
参考答案：A, B
What does the speaker mean
A．What would be the cost of your project
B．How much will it cost by the time you carry out the project
C．You know what your project would include.
D．That project of yours is very expensive.
