Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．Wearing arm weights while you are swimming.
B．Jogging vigorously in one place for a long time.
C．Using bicycles that require you use both your arms and legs.
D．Walking slowly while swinging your arms back and forth.

A．improvement in mathematics allows figures to be very accurate
B．this method has been used since ancient times and proved very effective
C．most scientists focus their investigations on the quakes of certain areas
D．continuous plate movements often result in earthquakes in certain areas