据资料统计，在明后期至清前期200余年间，世界白银产量的一半流人中国。拥有一流城市和

Water is (41) important of all the things we (42) and drink. Not many people understand this, (43) it’s quite true. The human body (人体) can go (44) food for a long time, but two (45) three days without water can usually (46) people die.
Many people don’ t understand how much water the human body needs to work well and many people do not drink (47) , even (48) hot weather.
Our body is (49) water, about 65% to 75%, ff we do not have enough water, we’ll (50) tired and many will get ill. So you see, how important water is to us all.

[A] fall [B] fell[C] feel

如图所示，平行板电容器与电动势为E的直流电源（内阻不计）连接，下极板N接地。在其两板间的P点固定一个带负电的点电荷。则以下说法正确的是

A．闭合开关，再将M极板向上移动少许，P点的电势增大，P点的负电荷电势能增大

B．闭合开关，再将M极板向上移动少许，电容器极板上所带的电荷量增加

C．闭合开关，再将N极板向下移动少许，P点的负电荷受到电场力增大

D．闭合开关，电容器充电后再断开开关，将N极板向下移动少许，P点的负电荷受到电场力不变

事前审计是指______所进行的审计。即对计划、预算的编制，以及对基本建设项目和固定资产投资决策的可行性研究等所进行的审计。

多个相邻毛囊及其皮脂腺的急性化脓性感染是（）。

A.疖病

B.痈

C.急性蜂窝织炎

D.脓肿

E.丹毒

沥青砂浆、沥青混凝土的质量标准是什么