第 1 页共 6 页课时跟踪练(一) Warming Up & Reading — Pre-readingⅠ.阅读理解AEdmund Halley was an English scientist who lived over 200 years ago. He studied theobservations of comets (彗星) which other scientists had made. The orbitof one particular comet was a very difficult mathem...

时间:2025-01-18 03:16栏目:行业资料