A．They can't train many medical care experts.
B．Medical workers are attracted to richer places.
C．They don't have favorable policies.
D．Their government doesn't care much about that.
A．They should seek help from international organizations.
B．They shouldn't allow their own professionals to work abroad.
C．They should invest more money in health care programs.
D．They should train more health care workers.
A．European countries tend to support having naps.
B．Working men should have a nap regularly.
C．Adults are more likely to develop heart disease.
D．Naps may lower the chance of dying of heart disease.