（辨析主题句） Read the following paragraph and choose the best topic sentence from the four options that follow. Write the corresponding letter of your choice on the Answer Sheet.
Many people begin their day by waiting for a bus or train. Then they may spend a few minutes waiting for an elevator to get to their offices. Moreover, the elevator may then stop at twenty floors, averaging a wait of twenty seconds each. After work, there's another wait for both an elevator and a bus or train. Most of us also spend a great deal of time waiting in the dentist's office, in line for tickets or fast food, and on the road in barely moving traffic.
Your choice:
A
Many people spend a lot of time just sitting or standing around.
B
Many people do a lot of waiting during their workday.
C
Waiting is a part of many people's lives.
D
Waiting is necessary in people's lives.
