单项选择题
Passage Two Questions 29 to 31 are based on the passage you have just heard.
A. Entertainment. B. Social adherence. C. Communication. D. Religious ritual.
A. Terrible computer viruses. B. Credit card scams. C. Personal information. D. Wry chuckles.
A. The quality of paper will improve. B. Paper prices will go down. C. Garbage dumps will decrease in size. D. Trees will be saved.