—Do you know Tsering Danzhou, a Tibetan ten-year-old boy in Yushu?

—Yes. He       the people his great help as a translator after the earthquake.

A．provided

B．supported

C．offered

D．Afforded

除了鲁奇炉，还有哪些气化技术已经实践证实（有工业化业绩或中试成功）适合用于无烟煤、贫煤等高阶煤的气化？