3、應(yīng)采取措施，解決缺水問題：充分利用，避免污染，凈化雨水或海水。

2、缺水問題越來越嚴重。原因是人口增長；工、農(nóng)業(yè)生產(chǎn)發(fā)展；環(huán)境污染。

1、水是生命的源泉，農(nóng)業(yè)的命脈、工業(yè)的血液！

33、Students are asked to ________themselves in this boarding school and they are only allowed to go back home once a week．

A．behave        B．a(chǎn)ct         C．perform          D．observe

32、Liz and Brian spent a long time______about which film to go and see．

A．discussing        B．quarrelling        C．complaining        D．a(chǎn)rguing

31、_____by keeping down costs will Power Data hold its advantage over other companies．

A．Even          B．Only          C．Still           D．Despite

30、Captain Scott’s example_______them with the determination to reach the South Pole on foot ．

A．respected         B．inspired         C．a(chǎn)dmired          D．prepared

29、It_____John and Mike that I met in the library yesterday afternoon．

A．was         B．were         C．had been         D．would be