这是初三英语书上的一句话after that,knowledge and ideas spread quickly.请问

1 after that,knowledge and ideas spread quickly.
此句中,spread 是不及物动词,如：The word spread fast. 消息散布得很快.
2 how are ideas spread today?
这里的spread 是及物动词,表示人为的散布思想,而spread 的过去分词就是自己,所以无需变形.
如：the pictures are spread before us.
3 books are a wonderful invention,and they are also much cheaper/cheaply than computers.
选much cheaper
much 这里是副词,修饰形容词比较级是一种固定搭配,翻为 “便宜得多”；而在多音节形容词里,它本身的比较级要加more ,所以就变成much more 了,如 they are much more expensive than books. “昂贵得多”

1.spread不用被动的，下面是一些例句。
the infection spread; Optimism spread among the population.
传染病蔓延；乐观主义在人群中蔓延。
Settlers soon spread inland.
移居到发展中地区的人不久就迁徙到内地了。
spread something around som...

1 spread 做及物/不及物动词，有传播，蔓延等等的意思
2 一个动词具体用主动语态还是被动语态，要具体判断才行
3 after that，knowledge and ideas spread quickly， 意思是在那之后，知识和思想传播地很快。 这里的 spread 做不及物动词，不需要用被动语态。
4 how are ideas spread today？ 是不...