单项选择题
Questions 27-30 For each question, only ONE of the choices is correct. Write the corresponding letter in the appropriate box on your answer sheet.
According to surveys, which of the following social factors makes a person look older（）
A． Having more than four children. B． Having a high BMI. C． Spending a long time in the sun.
单项选择题 How can exercise help make a person look younger（）
单项选择题 Which of the following nutritional factors makes a person look older（）
