题目

请阅读下面短文，然后按照要求用英语写一篇150词左右的文章。 Water is the driving force of all nature,Leonardo da Vinci claimed. Unfortunately for our planet, water supplies are nowrunning dry at an alarming rate. The world's population continues to increasebut that rise in number has not been matched by adequate supplies of freshwater. Reports show that more than a billion individuals-one in seven people onthe planet-now lack access to safe drinking water. In Sao Paulo, a Brazilian city, droughtgot so bad that residents began drilling through basement floors and car pa16．小明设计了如图所示的压力测量仪，可以反映弹簧上方金属片受到压力的大小．其中R′是滑动变阻器，R是定值电阻，电源电压恒定不变，压力表实际上是一个电压表．（　　）A．受压力增大时，电路总电阻变大，压力表示数变小B．受压力增大时，电路总电阻变小，压力表示数变小C．受压力增大时，电路总电阻变大，压力表示数变大D．受压力增大时，电路总电阻变小，压力表示数变大