单项选择题
A．the presence of religious institutions B．the preference for "old-fashioned" parents C．the limited role of tradition D．the presence of folk singers in church services
A．The fast pace produces nothing but ulcers and high blood pressure. B．It is not clearly told in the passage. C．The fast pace permits technological and scientific progress which benefits all people. D．He is not quite sure whether the American culture is agreeable.
A．Electric eels are potentially dangerous. B．Biology and electricity appear to be closely related. C．People would be at a loss without electricity. D．Scientists still have much to discover about electricity.