____ he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.

A．Although

B．Since

C．When

D．As

C语言规定，调用一个函数时，实参变量和形参变量之间的数据传递是( )。

A．地址传递

B．值传递

C．由实参传给形参，并由形参传回给实参

D．由用户指定传递方式