考试题型 1: 选词填空 13选10 In his 2003 speech at Rice University’s Energy & Nanotechnology Conference, the late Nobel Laureate Richard Smalley highlighted the top 10 problems for the next 50 years. In his list, 1 sits at the top, and water comes next. Now, with the price of solar power 2 , the dawn of a new energy era is just around the corner. As a result, 3 is going to be the greatest challenge for humanity. But the water problem is 4 . First, unlike coal and oil, water can not be 5 . Second, water is 6 with every other sector of society. Third, while water demands are growing, climate change is intensifying droughts and floods and water supplies are 7 . There are solutions, such as building water-transfer aqueducts, hydroelectric dams, and desalination plants. But they may be incredibly 8 . It will 9 for scientists to find affordable solutions to the water problem. Before that, everyone should do his or her bit to 10 water. (conserve; complicated; intertwined; water; strategic; era; fluctuating; replaced; take time; expensive; conflict; energy;going down; )