Here are summer activities in museums.

The Postal Museum

Date: July 16 to July 22

Age: 11—13

    Would you like to join us this summer vacation? You can learn about the history of stamps (邮票)and design (设计) a stamp yourself. You can also enjoy many beautiful pictures in our museum.

Tel: 965-0403

The Air and Space Museum

Date: July 24 to July 30

Age: 8—11

    If you like activities about air and space, please come here. It's a good place to make and fly your own paper plane, watch an IMAX movie, and climb into a real plane.

Tel: 654-0937

The Science Museum

Date: August 7 to August 13

Age: 9-12

    You can experience video arts, play computer games about future cities, and ask robots questions here. It will be wonderful! Have fun!

Tel: 357-3039

The Building Museum

Date: August 15 to August 22

Age: 13-15

    Want to enjoy design challenges (挑战)? Come and join us. You can go on trips to some famous buildings, learn to design your own room, and build small houses,

Tel: 272-0561

根据材料内容选择最佳答案。

①硫+氧气 $\stackrel{点燃}{\to }$ 二氧化硫；              

②蜡烛+氧气 $\stackrel{点燃}{\to }$ 二氧化碳+水；

③碱式碳酸铜 $\stackrel{加热}{\to }$ 氧化铜+二氧化碳+水；

④乙炔+氧气 $\stackrel{点燃}{\to }$ 二氧化碳+水．

⑤氯酸钾 $\stackrel{二氧化锰}{\underset{加热}{\to }}$  氯化钾+氧气．