he past 20 years the once-sleepyfishing village ______ into an international tourism destination, with manyvisitors coming to explore its spectacular rainforests and beaches．

把下列带序号的句子组合成语意连贯的一段话，最恰当的一组是①理想从来没有高纯度的范本②它的出现，是心智对物界和实证的超越③它只是一种完美的假定④是数学之镜中一次美丽的日出⑤有点像数学中的虚数⑥这个数没有实际的外物可以对应，但它常常成为运算长链中不可或缺的重要支撑和重要引导

hina’s Singles’ Day approaching, shop owners offer large discounts ______ high sales volumes created by enthusiastic buyers.

Miss Wang teaches _______ Maths.

15．– How cold it is! I wonder how grass survive under such heavy snow． –Don’t worry．There is a lot of air in loose snow which _______．