By the middle of the 21st century, the vast majority of the world ’s population will be living in cities _______ in the country.
D
本题考查词组辨析。ratherthan：与其…(不如);不是…(而是)。句意：到二十一世纪中叶，世界上大多数人口将生活在城市而不是农村。
Thehousewasquietinthenight,________theoccasionalcoughingfrommythroat.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.
In Europe _______ are the two leading contenders for a global reservations system.