615.They experimented ________ the new medicine ______ animals.

A.on;to

B.by;on

C.with;on

D.with;to

616.The visiting Prime Minister hoped for greater trust between the two nations,more trade,more cultural exchanges.______ a genuine peace.

A.In detail

B.In total

C.In common

D.In short

615.答案是C;

考查介词的用法。句意:他们用这种新药在动物身上做实验。Experiment on sb.with sth. 用…在某人身上做实验。

616.答案是D;

in detail 详细地；in total 总计；in common 共同的；in short 简而言之。