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.
How can exercise help make a person look younger（）

A. By making them feel happier.
B. It helps keep type Ⅱ muscle fibres in better condition.
C. It increases oxygen flow.

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单项选择题

A． Eating lots of fruit and vegetables.
B． Not eating enough protein.
C． Eating lots of meat.