The Beijing-Tianjin-Hebei region has natural cultural and emotional links due to the geological location. Economic, social and cultural exchange areas are necessary for further development.
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2019年9月30日习题回顾
While mobile payment is already（）on the Chinese mainlan scanning a code with a smartphone to pay for a product or service wasn't a popular option for Hong Kong people until lately
A)oblivious
B)obliterated
C)ambivalent
D)ubiquitous
答案：D. Ubiquitous
解析：A.oblivious adj. 遗忘的；健忘的；不注意的；不知道的
B.obliterated v.摧毁，毁灭
C.ambivalent adj.矛盾的
D. ubiquitous adj. 普遍存在的；无所不在的
根据常识和句意，移动支付在中国大陆应该是无所不在的，因此选 D。
题源：China Daily:A digital bank for the world's unbanked(2017-11-17
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