单项选择题

A．Even
B．Therefore
C．But
D．Furthermore
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S2. In general, cancer cells divide at a higher rate than do normal cells, but the distinction between the growth of cancerous and normal tissues is not so much the rapidity of cell division in the former as it is the partial or complete loss of growth restraint in cancer cells and their failure to differentiate into a useful, limited tissue of the type that characterizes the functional equilibrium of growth of normal tissue.
单项选择题
A．demonstratedB．composedC．formedD．hosted
A．demonstrated
B．composed
C．formed
D．hosted
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