A:x<1
B:x≥3
C:1≤x<3
D:1<x≤3
Travelling to London
We think ⑴ is the best season to visit England.
We did most of our sightseeing(观光) ⑵ .
The best part of the trip was going to the theatre.
We don't think the English food is very ⑶ .
家鸽进行气体交换的部位是( )