材料一：
   
材料二：“山地之国”瑞士多样的地形，奇特的景观使其成为旅游胜地，夏季众多的山峰吸引着大批登山爱好者，冬季滑雪爱好者云集，旅游业成为瑞士的支柱产业之一。人们对生态环境厚爱有加，修建了阿尔卑斯山区的自然保护区，为濒危动物提供了安全的生存地。

Keep the windows ____ (open), please. It's a little hot in the room.

让一束太阳光通过棱镜射到白屏上，把一支温度计放在色光中的红光外侧，可以发现温度计示数____  (填“上升”、“不变”或“下降”)，这说明了红光之外有一种不可见光，它叫____ 。为加强温度计的灵敏度，可将温度计的玻璃泡涂上____ 色。

    Sam's parents took her to the World Park last week. He saw Big Ben, the Tower Bridge, Disneyland in America, the CN Tower, Niagara Falls and the Sydney Opera House. His father told her Big Ben and the Tower Bridge are in London. Her mother told her Niagara Falls is in Canada and the Sydney Opera House is in Australia. He learnt about many things of the famous places around the world.