Unit 7 What’s the highest mountain in the world? It is also very hard to take in air as you get near the top. 当你接近山顶时，连呼吸都会困难。 这些登山者的精神向我们证明：我们永远都不应 该放弃实现自己的梦想。 sth. /sb. +be+数量+单位+形容词long, wide, tall ...