24. A) By harassing them.

　　25. D) Supportive.

　　26. B) The air pressure is low.

　　27. C) People knew long ago how to predict the weather.

　　28. B) People can predict the weather by their senses.

　　29. D) They feel burdened with numerous tasks every day.

　　30. B) Draw a detailed to-do list.

　　31. A) They have accomplished little.

　　32. A) Their performance may improve.

　　33. B) Increased susceptibility to disease.

　　34. D) Pay more attention to bodily sensations.

　　35. C) The relationship between stress and illness.

　　36 appearance

　　37 symbol

　　38 decades

　　39 exported

　　40 apparent

　　41 percentage

　　42 combination

　　43 convenient

　　44 Our air quality now suffers from the effects of pollutants emitted directly from our cars.

　　45 The problems caused by motorized vehicles in the West are often magnified in developing nations.

　　46Movement in some cities comes to a virtual standstill as motorized traffic competes with bicycles and pedestrians.

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