• A. must be very boring
• B. some kind of recreation
• C. participating in them
• D. to relax oneself
• E. to choose one’s own way of relaxing
• F. maintain good health

Participating in door sports or outdoor sports is a good way ______.

A．in
B．on
C．of
D．to

A．The water from the shower head is full of bacteria.
B．The water would be drunk by the people when taking shower.
C．The bacteria- filled droplet in the air would be inhaled by people.
D．Because the shower heads are usually used by more than one peopl