Questions 23 to 25 are based on the conversation you have just heard.

A．Each student must pass a national examination.
B．Students who do best in the studies have a greater chance.
C．They can seek to enter a number of medical schools.
D．There arc good chances to gain the entrance.

A．Enforcing laws controlling navigation, shipping, immigration and fishing.
B．Enforcing laws affecting the privately-owned boats in the U. S.
C．Searching for missing boats and rescuing people.
D．Training people to be good swimmers along the beach.