单项选择题
A．attacking the diseased cells with healthy ones B．controlling the growth of the cells C．detecting disordered genes in the cancer cells D．activating cancer cells by switching them on
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