By saying "the U.S. and China have opposite problems" (Line 1, Para.1), the author thinks that the saving problems in the U.S. and China are ______.

A．A language teacher.
B．A university lecturer.
C．A doctor.
D．A nurse.

A．The patient is physically ill.
B．The patient is mentally ill.
C．The patient is basically fit.
D．The patient is nervous.