空气调节冷、热水系统的设计应符合哪些规定？

In much of Asia, especially the so-called “rice bowl” cultures of China, Japan, Korea,   41   Vietnam, food is usually eaten with chopsticks.

Chopsticks are usually two long, thin pieces of wood or bamboo. They can also be made of plastic, animal bone or metal. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might  42   (make)of gold and silver with Chinese characters. Skilled workers also combine various hardwoods and metal  43  (create)special designs.

The Chinese have used chopsticks for five thousand years. People probably cooked their food in large pots, 44  (use) twigs(树枝) to remove it. Over time,  45  the population grew, people began cutting food into small pieces so it would cook more quickly. Food in small pieces could be eaten easily with twigs which  46  (gradual)turned into chopsticks.

Some people think that the great Chinese scholar Confucius,  47  lived from roughly 551 to 479 B.C., influenced the  48  (develop) of chopsticks. Confucius believed knives would remind people of killings and  49   (be) too violent for use at the table.

Chopsticks are not used everywhere in Asia. In India, for example, most people traditionally eat   50  their hands.

47（）

下列免疫制剂属于减毒活疫苗的是（）

A.卡介苗

B.脊髓灰质炎疫苗

C.伤寒疫苗

D.白喉疫苗

E.乙肝疫苗

音乐作品：民乐《二泉映月》

银屑病的病理特征不包括（）

A.表皮下大疱

B.角化过度

C.Munro微脓肿

D.角化不全

下列选项中，通讯网络主要在国外，新闻稿主要为国际新闻，在国外设了5个总分社的通讯社是（）

A.美联社

B.路透社

C.合众国际社

D.法新社