Stress is with us all the time. It comes from mental or emotional activity as well as physical activity. It is unique and personal to each of us. So personal, in fact, that what may be relaxing to one person may be stressful to another. For example, if you’’re a busy executive who likes to keep occupied all of the time, "taking it easy" at the beach on a beautiful day may be extremely frustrating, nonproductive, and upsetting. You may be emotionally distressed from "doing nothing." Too much emotional stress can cause physical illnesses such as high blood pressure, ulcers, or even heart disease. Physical stress from work or exercise is not likely to cause such ailments. The truth is that physical exercise can help you to relax and to better handle your mental or emotional stress.

One method mentioned to help handle stress is________.

A．physical exercise

B．tranquilizers

C．drugs

D．taking it easy

埋入建筑物、构筑物的电线保护管，为确保暗敷设后不露出抹灰层，以免由于锈蚀造成抹灰面脱落，影响整个工程质量，故管路与建筑物、构筑物主体表面的距离不应( )。

A．大于10mm
B．小于10mm
C．大于15mm
D．小于15mm