硫燃烧产生的二氧化硫气体会造成空气污染。为避免二氧化硫污染空气，某教师对教材中“硫在空气和氧气中燃烧”的实验进行了改进与创新，设计了如图甲所示的实验装置：

【实验原理】

① B装置是燃烧匙固定在带有A导管的单塞上，硬质玻璃管透光性好，不影响实验现象的观察；

② C装置的广口瓶中盛放氢氧化钠溶液可吸收二氧化硫气体，避免污染；

③ 打开D装置中的阀门，气体就会从左向右依次进入装置。

【实验过程】

步骤一：将硫粉放在燃烧匙上，在空气中点燃后，迅速伸入硬质玻璃管内（如图B装置），打开阀门，观察硫在空气中燃烧的现象；

 步骤二：将导管a伸入盛有氧气的集气瓶中（如图A装置），观察硫在氧气中燃烧的现象。

 【交流讨论】

我国西北地区牧区的特点是（　　）

    Cheongsam (also known as Qipao ), is a kind of traditional Chinese dress for women. It1from Manchu people of the Qing Dynasty(清朝) in the early 17th century.

    Once there was a young fisherwoman living near a place called Jingbo Lake. She made a living by fishing,2only problem was that when fishing she often felt bad because of her long wide clothes. Then an idea came into her3 — why not make a more comfortable dress to wear. Then she invented Qipao that helped herself fish 4.

    The5emperor(皇帝)who was in control of China at that time had a dream one night. In the dream, his dead father told him a lovely fisherwoman wearing a long dress, who lived by Jingbo lake, would 6 his wife. After that, the emperor sent some people to7that woman. At last, they found her8the place which his father told him. Then she became the emperor's wife,9her beautiful Qipao with her. Manchu women all liked Qipao and soon it became popular across China. Now it's also well-known all over the world. Not only Chinese women, but also women from foreign10such as Indonesia, are interested in wearing it.

This kind of traditional dress is made of either silk or cotton. And anyway, it becomes one of the symbols(象征) of China.

（2016•广东）春秋战国时期，学派纷呈．其主张能体现题表所示内容的学派是（　　）