“Of all the mood changing self –help techniques, aerobic exercise(有氧运动)seems to be the best cure for a bad mood. If you could keep the exercise, you’d be in high spirits,” says Kathryn Lance, author of Running for Health and Beauty.

　　Researchers have explained biochemical and various other changes that make exercise more effective than drug as a mood- raiser. Physical work such as house-work, however, does little good. The key is aerobic exercise---running, cycling, walking, swimming, or other repetitive activities that increase the heart rate and circulation, and improve the body’s use of oxygen. Do them for at least 20 minutes a time, three to five times a week. 67. It can be inferred from the passage that ___________.

　　A. when one is in a bad mood, he or she may not work very well.

　　B. the best way to overcome a bad mood is to talk to oneself.

　　C. some drugs are more effective than physical exercise.

　　D. taking drugs is at the risk of being harmed.

　　68. “Feel out of sorts”(in Paragraph 2 ) could be best replaced by _________.

　　A. put things in order

　　B. search for tranquilizers

　　C. are in bad mood

　　D. are in high spirits

　　69. Which of the following best describes the organization(组织) of this passage?

　　A. A way of exercise and its importance are explained.

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