649.The manager is talking with his secretary _______ the telephone.They usually keep in touch ________ telephone.

A.by;on

B.through;by

C.on;on

D.by;with

650.What idea can a man who is blind from rich have _____ color?

A.in

B./

C.With

D.Of

649.答案是B;

talk with sb.through/on the phone 和某人通过电话交谈；keep in touch with sb.by telephone 通过电话保持联系。by后接交通工具或通讯工具。

650.答案是D;

have some idea of sth.对…有所了解/认识。