D. develops the heart, lungs, and circulatory systems
3. We can conclude from this passage that ______.
A. because of jogging, heart disease is no longer an American problem
B. jogging can be harmful if the runner is not properly prepared
C. warm-up suits are preferable to gym shoes and T-shirts
D. jogging is bad for the ankles and knees
4. The authors tone ______.
A. skeptical B. aggressive C. approving D. purely objective
5. As used in this passage, the word mystical means ________.
A. awesome B. horrifying C. a spirtual discipline D. vicious
参考答案:ADBCC
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