Some people believe that to have an effective conversation，a distance of about 20 inches(51 centimeters)between the two parties involved is required．In certain cultural groups．however，the normal conversational distance is in the range of 14 to 15 inches(36 to 38 centimeters)：and some group say 9 to 10 inches(23 to 25 centimeters) is ideal．People from some cultural groups may keep a door open during a negotiation．whereas others may prefer to close the door．Some people feel they should be separated from another person by a desk．This area of nonverbal communication is important for cross-cultural communication．It is known as______．

A．proxemics

B．personal space dynamics

C．posturing

D．linguistics

急性炎症性脱髓鞘性多发性神经病的脑脊液特征性改变是（）。

A.脑脊液细胞数升高

B.脑脊液蛋白－细胞分离

C.脑脊液氯化物升高

D.脑脊液糖含量升高

E.脑脊液蛋白升高