Questions 22 to 25 are based on the conversation you have just heard.

A．It lies in a sense of fulfillment.
B．It lies in their rich imagination.
C．It lies in the increase of their knowledge.
D．It lies in the opportunity to continue the search.

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.