26. Many western-style fast-food restaurants are ________ in the cities though they haven’t encroached upon rural areas.
(A) ubiquitous
(B) unnatural
(C) unique
(D) unified

(A) ubiquitous
seeming to be everywhere
普遍存在的，似乎無處不在的
Leather is very much in fashion this season, as is the ubiquitous denim.
The Swedes are not alone in finding their language under pressure from the ubiquitous spread of English.
The mobile phone, that most ubiquitous of consumer-electronic appliances, is about to enter a new age.

(B) unnatural不自然
→natural
as found in nature and not involving anything made or done by people
天然的，非人為的；非人造的
People say that breast-feeding is better than bottle-feeding because it's more natural.
He died from natural causes (= because he was old or ill).
Floods and earthquakes are natural disasters.
A natural ability or characteristic is one that you were born with.
（能力）天生的；（特性）固有的
She's a natural blonde (= her real hair colour is blonde).
normal or expected
正常的；平常的；當然的
Of course you're upset - it's only natural.
It's natural that you should feel anxious when you first leave home.
It's quite natural to experience a few doubts just before you get married.
someone who was born with the right characteristics or abilities for doing a particular thing
天生具有…才能的人，有…天賦的人
She won't have any troubles learning to ride a horse - you can see she's a natural.


(C) unique
being the only existing one of its type or, more generally, unusual, or special in some way
獨一無二的；與眾不同的；唯一的；獨特的；罕見的
Each person's genetic code is unique except in the case of identical twins.
I'd recognize your handwriting anywhere - it's unique.
Do not miss this unique opportunity to buy all six pans at half the recommended price.
As many as 100 species of fish, some unique to (= only found in) these waters, may have been affected by the pollution.

(D) unified
brought together, combined, or united
統一的
We have to be able to speak with a unified voice on this subject.
The politicians find themselves unusually unified on everything from tax policy to foreign affairs.

資料來源：劍橋辭典