【简答题】Rivers are the veins of the Earth, transporting the water and nutrients ( 营养物 ) needed to support the planet’s ecosystems, including human life. While many nutrients are essential to the survival of l...
【判断题】“In a certain city, a water supply company issued a noticeabout cutting off the water supply. At first, the public were only told thatthe running water company needed to service the pipeline. However,...