单项选择题
| Questions 5 to 7 are based on the following passage. |
Why people in the mountainous regions live longer Study...
问答题Why people in the mountainous regions live longer Study the following table carefully and write an article based on the information given below.
Investigation
| Area | Investigated | Celebrate 100th birthday |
| The mountainous regions | 100 000 | 50 |
| The large cities | 100 000 | 3 |