By saying "it might as well begin with the words once upon a time" (Line 3, Para. 1) the author suggests that the American myth is______.

A．If they don’t involve any risks.
B．If they produce predictable side effects.
C．When the urgent need for them arises.
D．When tests show that they are relatively safe.

A．The long wait.
B．The broken-down computer.
C．The mistakes in her telephone bill.
D．The bad telephone service.