A．The man can stay in her brother’s apartment.
B．Her brother can help the man find a cheaper hotel.
C．Her brother can find an apartment for the man.
D．The man should have booked a less expensive hotel.

A．To show how simple the mechanical aids for diving can be.
B．To provide an excuse for his changeable character
C．To explore the philosophical issues of space travel.
D．To explain why he took up underwater exploration.