两个英语问题求教 1 as的用法 I am as young as him.那淮海路和南京路一样

两个英语问题求教 1 as的用法 I am as young as him.那淮海路和南京路一样
热闹,如果翻译的话应该是
Huaihai Rd is as lively as Nanjing Rd.
但是我看翻译答案是
It is as lively on Huaihai Rd as on nanjing Rd .(°_°)
路名不可作主语吗?
然后是＂今天和昨天一样热＂的答案是
It is as hot today as it was yesterday.
我就更纠结了,on Nanjing Rd 的主语呢?不要说 it is on Nanjing Rd.
2
下面就更纠结了
〜还算〜,英语是be regarded as 形容词 或 be considered 形容词
比如 the transport facilities here are regarded as good.
好吧〜就不可以用单数吗?
他身体还算健康.
答案是his health can be regarded as good .
我晕he is regarded as good .
还有一题,这价钱不算贵.
price can't is regarded as an expensive one .
Σ（ﾟдﾟlll）an expensive one 为什么丫!不是形容词就可以了吗?我翻译的话一定是 the price isn't regarded as expensive.大大救救我.