Questions 27-30 For each question, only ONE of the choices is correct. Write the corresponding letter in the appropriate box on

admin2012-09-10  13

问题 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.

*

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

答案B

解析
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