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ad.乐意地，爽快地快速地，便利地

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v.(不得不)承认

vi.变理智；（举止）变成熟;成熟，成长a. 成熟的，理智的，明白事理的

In his 2003 speech at Rice University’s Energy & Nanotechnology Conference, the late Nobel Laureate Richard Smalley highlighted the 10 problems for the next 50 years. In his list,_sits at the top, and water comes next. Now, with the price of solar power going down, the dawn of a new energy _is just around the corner. As a result, is going to be the greatest challenge for humanity.But the water problem is complicated. First, unlike coal and oil, water cannot be _. Second, water is intertwined with every other sector of society. Third, while water demands are growing, climate change is intensifying droughts and floods and water supplies are fluctuating.There are solutions, such as building water-transfer aqueducts, hydroelectric dams, and desalination plants. But they may be incredibly expensive. It will take time for scientists to find affordable solutions to the water problem. Before that, everyone should do his or her bit to conserve water.

人员进入洁净生产区的程序正确的为()。

A. 换鞋→脱外衣→穿一般工作衣→换洁净工作衣
B. 换鞋→脱外衣→洗手→换洁净工作衣→进入洁净区
C. 换鞋→脱外衣→洗手→换洁净工作衣→手消毒→进入洁净区
D. 换鞋→脱外衣→穿一般工作衣→换洁净鞋→换洁净工作衣→进入洁净区→手消毒