(10分)短周期元素A、B、C、D、E的原子序数依次增大，已知： ①C的最高价氧

污染物排放量的计算，通常采用的三种方法是：（）。

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.

Which of the following would be a determinant as to what people find stressful

A．Personality.

B．Education.

C．Marital status.

D．Shoe size.

按规定，建设工程四级重大质量事故应由( )归口管理。

A．国务院

B．国家建设行政主管部门

C．省、自治区、直辖市建设行政主管部门

D．市、县级建设行政主管部门

国际社会应该加强对话合作，推动互联网全球治理体系变革，共同构建（）的网络空间，建立多边、民主、透明的全球互联网治理体系。

A、和平

B、安全

C、开放

D、合作