D. Listen to a passage and complete the answer to each question (in no more than 3 words). Both the passage and the questions will be read two times. 16. What will you see if you go to a fast food restaurant or a snack bar? We will see a lot of . 17. Why are many agers overweight? This is partly because of their . 18. What do people call such food with a lot of fat, oil, salt and sugar? They often call this kind of food . 19. How many students don't follow a healthy diet according to a recent survey? Over .(两种写法：英文、数字) 20. How many students don’t like vegetables? Nearly .（同上）