take to 是固定搭配,意思是“開(kāi)始經(jīng)常做某事”（to start doing something often）
另例：
She was so depressed she took to drink.
（她（那時(shí)）很壓抑,然后開(kāi)始酗酒.）
become 后的to 不是接在become之后,而是接在integral之后的,這個(gè)短語(yǔ)是become integral to ...（逐漸融入到……）.整個(gè)句子因?yàn)閟o引起了倒裝（助動(dòng)詞have 位于主語(yǔ)之前）,所以讀到become時(shí)需要停頓.
另例：
Bars and cafés are integral to the social life of the city.
（酒吧和小飯館融入到這座城市的社會(huì)生活中.）