核反应方程:how long way it is 这个句子对不对,为什么?

how long way it is 这个句子对不对,为什么? How long ()since I bumped into you at McDonald?选 is it ，was it为何不对？ Which is the longest river in china ?How long is it? How far is it from Beijing to Shanghai?How long will it take to go Beijing by train/plane? how far is it from BeijingtoShanghai?how long will it take to go to Beijing by train/plane How long is a shoe ? How long is a shoe? What amazed me is how long he managed to hide it from me How is it possible how much is it?