So far, no agreement ________ on which type of exercise is best suitable for keeping fit.

A．has reached

B．has been reached

C．was reached

D．had been reached

在不影响动物实验的前提下，对动物身体的强制性限制宜减少到（）程度。

A.最低

B.实验需要的

C.适中的

D.实验者需要的