【正确答案】
A
【答案解析】
[听力原文]Questions <19>-<21>
Mrs. Green was the
manager of a large company, and frequently had to have meetings with other
business people in a room in her building. She did not smoke at all, but many of
the other people at the meetings did so. She often found the air during the
meetings terrible. One day, after an hour, her throat and eyes were sore, she
was coughing a lot, so she called a big air-conditioning company and asked them
to work out how much it would cost to keep the air of the meeting room in her
building really clean.
After a few days the air-conditioning
company sent two estimates for Mrs. Green to choose from. One estimate was
$5,000 to put in new air-conditioning, and the other was for $5.00 for a sign
which said, "NO SMOKING".