阅读理解 Seasonal pumped hydropower storage（SPHS），an already established yet infrequently used technolog

阅读理解
Seasonal pumped hydropower storage（SPHS），an already established yet infrequently used technology ,could be an affordable and sustainable solution（解决方法）to store energy and water annually, according to new IIASA research published in the journal Nature Communications. Compared with other mature storage solutions, such as natural gas, the study shows that there is considerable potential for SPHS to provide highly competitive energy storage costs.
Seasonal pumped hydropower storage means pumping water into a deep storage reservoir（水库）, built parallel to a major river, during times of high water flow or low energy demand. When water is not enough or energy demand increases，stored water is then released from the reservoir to generate electricity.
The new study is the first to provide a global, high-resolution analysis of the potential and costs for SPHS technology. In their analysis, researchers assessed the theoretical global potential for storing energy and water seasonally with SPHS, focusing on the locations with the highest potential and lowest cost. They found that the technology would be particularly effective in the Himalayas, the Andes, Alps，and the Rocky Mountains, as well as mountainous regions in the Middle East, Brazil, Asia, and Russia, and many other locations around the world.
The study also addresses some of the potential environmental concerns related to hydropower. Because SPHS reservoirs are deep and constructed parallel to, rather than within the course of a river, the environmental and land use impacts can also be up to 10 to 50 times smaller than conventional hydropower plants.
Hunt, lead author of the study, says, “With the need for a change to a more sustainable world with lower CO2 emissions（排放），renewable energies and energy storage will play a major role in the near future. Given the vast untapped（未开发的）and cheap potential of SPHS, it will soon play an important role in storing energy and water on a yearly basis.”
28. What is the strength of SPHS based on the new IIASA research?
A. It’s costly. B. It’s out-dated.
C. It’s rarely used. D. It’s inexpensive.
29. What do researchers concentrate on when assessing the use of SPHS?
A. Environmental protection. B. High profits.
C. Suitable places. D. Water flow.
30. What do we know about the SPHS reservoirs in Paragraph 4?
A. They damage the river.
B. They are environmentally friendly.
C. They are similar to traditional hydropower plants.
D. They can be effective in many places globally.
31. What’s the future for SPHS according to Hunt?
A. Promising. B. Panicking.
C. Discouraging. D. Demanding.