2014年是川藏、青藏公路建成通车60周年。这两条公路的建成通车，是在党的领导下新中国取得的重大成就，对推动西藏实现社会制度历史性跨越、经济社会快速发展，对巩固西南边疆、促进民族团结进步发挥了十分重要的作用。当年，10多万军民在极其艰苦的条件下团结奋斗，创造了世界公路史上的奇迹，结束了西藏没有公路的历史。60年来，在建设和养护公路的过程中，形成和发扬了一不怕苦、二不怕死，顽强拼搏、甘当路石，军民一家、民族团结的“两路”精神。2014年8月，******就川藏、青藏公路通车60周年作出重要批示，要求进一步弘扬“两路”精神，助推西藏发展。

根据材料内容，选择正确答案。

    Toronto is the biggest city in Canada. It is famous for the CN tower, Niagara Falls(尼亚加拉大瀑布)and some other famous places.

    The CN tower is 553 metres high. It is the world's highest tower. You can stand on a glass floor. Do you think it may break? If you think so, you are wrong, because the glass is very strong. If you look down from the CN tower, you will see a large stadium, the Skydome (天虹体育馆). The Skydome has a special(特殊的) roof(屋顶). The roof can open and close. So don't worry about the rain when you are watching a match there.

    Niagara Falls is one of the biggest falls in the world. It is made up of two falls. One is in the US. People call it American Falls. The other is in Canada. People call it Canadian Horseshoe Falls. The Horseshoe Falls drops from 52 metres high. It is 679 metres long. The sound of the water falling is so loud there. You cannot hear yourself talk! It is very exciting!

二战期间，中国曾两次和英美共同发表宣言或公告，这说明（　）

如图是某款有加热和保温功能的电热饮水机电路原理图，机内有温控开关S₀．该饮水机的部分参数已知：额定电压为220V，加热时的总功率为880W，保温时的功率为40W，R₁、R₂为加热电阻丝．（假设它们的阻值不变）求：（计算结果若不能整除，保留一位小数）