How many cameras does the man use a lot

A．The city was to be designed together with a harbor.
B．The walls around the city would be made of steel and glass.
C．The building of the city would rest on a floating island.
D．The people would live in tall building surrounded by a wall.

A．Examinations in modern times are written, while in ancient times they are spoken.
B．The objective test has advantages for testing a student’s memory of facts and details.
C．The objective test is the only way to test a student’s memory of facts and details.
D．Each objective question has more than one correct answer.