下列两个成语与我们所学的化学知识有关．简述其中的化学原理． 百炼成钢（将反复烧红

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Have you ever studied abroad? Maybe it is an amazing experience, especially when you come to Australia as an foreign high school student. You can have a lot of fun there, especially on holidays.
There are many festivals in Australia. The most important one is Christmas. Each year, the summer holidays at every high school last about two months from the beginning of December to February, which covers the Christmas time. Since it is a long holiday, most foreign students in Australia students still stay in Australia during the holiday to get part-time jobs. It is quite easy to find a part-time job at Christmas. Students often take part in another major social activity. They go to the beach to have fun in the sunshine. The summer in Australia is from December to February, so going to the beach in December is very popular among Australians.
Easter in March is another important holiday in the year. It actually combines “Good Friday” and “Easter Monday”. Almost every shop closes on Good Friday. And people usually go to see Easter Show.
The Chinese New Year is not a public holiday in Australia, so every Chinese student still has to go to school to study and do his or her normal duties.
Information about Australia

小题1: _______________ holidays	From the 小题2:__________ of December to February
The most popular activity in December	小题3:______________
Two important holidays	Christmas and 小题4: ________________
The thing people usually do on Good Friday	Go to 小题5: _____________ Easter show
What to do for a few foreign students in summer	小题6: ____________ to the beach to enjoy the sunshine