何首乌具有的功效是
A．补血，润肺止咳B．滋阴，补益心脾C．解毒，润肠通便D．养血，益胃生津E．敛阴，补血益精
参考答案：C
Would you please keep silent? The weather report _______ and I want to listen.
A．is broadcast
B．is being broadcast
C．has been broadcast
D．had been broadcast
常见的交互任务有哪几种？你认为哪一种交互任务最难完成？
