A．Because they are painful after transplants.
B．Because drugs can ease the burden of organs.
C．Because the body still reacts enough to cause transplants to fail.
D．Because the donor organs will fail in a very short time.

A．Team members should be guaranteed coffee breaks on working days.
B．Informal social connections among members establish more efficient work.
C．It is unnecessary for team leaders to hold informal meetings with members.
D．Coffee breaks at different times make members more satisfied with their jobs.