单项选择题
A．unable to give birth to a child B．with physical and emotional problems C．short of time and money D．separated from each other for long
A．moving the damaged part of the heart B．replacing the old heart with a cloned one C．repairing the heart with cells cloned from healthy ones D．giving the patients injections of various medicines
A．the treatment of heart attacks B．the bearing of babies C．the cure of blood diseases D．the detection of gene-related diseases