某同学做托里拆利实验，测得玻璃内水银柱比槽内水银面高出76cm，下列措施中可以使这个高度差改变的是（   ）

    October the ____ was National Day. I went to Hawaii for vacation ____ my family. We went to the airport first and went to Hawaii by ____. We lived in a small hotel for a night. The next morning we went ____ in the sea for 2 hours, we ____ very happy. So we lay on the ____ to have a rest. Then we walked back to the hotel. On our ____ to the hotel, it began to ____. And we didn't have an umbrella with us. We all got____. ____ a bad vacation!

如图是甲、乙两种物质的熔化图象，由图象可知____ 种物质是晶体，该晶体的熔点是____ ℃

洪水和雨涝容易同时发生的地区是(    )