单选题 Questions 3—4 refer to the following graphs.

单选题 In 1996, what percent of fourth-graders did between 1 and 2 hours of homework per day?

A. 5%
B. 15%
C. 25%
D. 40%
E. 55%

A
B
C
D
E

【正确答案】 B

【答案解析】From the top graph, we see that among fourth-graders in 1996: 25% did no homework; 55% did less than 1 hour; 5% did more than 2 hours. This accounts for 85% of the fourth-graders; the other 15% did between 1 and 2 hours of homework per day.

单选题 If in 1984 there were 2,000,000 eleventh- graders, and if between 1984 and 1996 the number of eleventh-graders increased by 10%, then approximately how many more eleventh-graders watched 1 hour or less of television in 1996 than in 1984?

A. 25,000
B. 50,000
C. 75,000
D. 100,000
E. 150,000

A
B
C
D
E

【正确答案】 E

【答案解析】In 1984, approximately 540,000 eleventh-graders watched television 1 hour or less per day (27% of 2,000,000). By 1996, the number of eleventh graders had increased by 10% to 2,200,000, but the percent of them who watched television 1 hour or less per day decreased to about 18%: 18% of 2,200,000 is 396,000. This is a decrease of 144,000, or approximately 150,000.