听第 10 段材料,回答第 17 至 20 题。 17 . What are “mall rats” according to the speaker? A . Those who spend a lot of time in malls. B . Those who shop regularly in malls. C . Those who steal things from malls. 18 . Which is NOT the reason why people like malls? A . Feeling safe. B . Free parking. C . Reasonable price. 19 . How many night clubs are there in the Mall of America in Minnesota? A . 35. B . 8. C . 7. 20 . When was the first indoor mall built in America? A . In 1935. B . In 1963. C . In 1965.