单项选择题
A. the creation of new entities B. an explosion of huge stars C. the tiniest particle D. the same amount of mass E. the existence of black holes F. a fraction of an inch
A．They became less aggressive towards other creatures. B．They lost interest in people. C．They started eating more. D．Other animals started working with them.
A．They grow faster in a reactor. B．They will be planted everywhere. C．They are cheap to eat. D．They can be a good energy source.