Questions 24-30 ·Look at the questions fo
题型：单项选择题
问题：
Questions 24-30
·Look at the questions for this part.
·You will hear a passage about "Health and Fitness ". You will listen to it twice.
·For Questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.
What percentage of Americans are reported to be at least 20 percent over their desirable weight in the 1990s
A．One fifth.
B．One fourth.
C．One thir