阅读理解。 The following form (表格) shows something about some after-class activities in a high school. 100% means all the students, 51-99% means most students, 15-50% means some students and 0% means no students. Activities Every day Once or twice a week Three or four times a week Doingthe Housework 5% 75% 20% Exercising 25% 10% 65% Surfingthe Internet 10% 85% 15% 1. This form is about the _________ of the students in a high school. A. after-class homework B. life C. health D. after-class activities 2. 20% of the students ___________ three or four times a week. A. exercise B. do the housework C. surf the Internet D. do their homework 3. _________of the students take exercise once or twice a week. A. 65% B. 20% C. 10% D. 75% 4. Only 15% of the students surf the Internet ___________. A. once a week B. every day C. three or four times a week D. twice a week 5. If there are fifty students doing the housework every day., there will be ________ students surfing the Internet every day. A. 100 B. 150 C. 5 D 250