( )是指从上代继承下来的解剖生理上的特点，这些生理特点是个体发展的物质前提。
参考答案：遗传
30．As he has been in a terrible state of mind these days, on no account ________ achieve success in the coming English speech competition.
A．has he
B．he has
C．will he
D．he will
第四方物流的定义是什么？它具有哪些特征？
