.UNESO is an international organization ,which United Nations Educational, Scientific and

.UNESO is an international organization ,which United Nations Educational, Scientific and Cultural Organization.
A. is short for
B. is lack in
C. are short of
D. are lack of

A. is short for(答案→)B. is lack inC. are short ofD. are lack of解析：考查固定词组，is short for意思“是…缩写”，is lack in意思“缺乏”，are short of意思“缺乏”，由which做主语，可以判断句子的谓语是单数还是复数，是单数，首先排除C、D，根据意思“联合国教科文租住是一个国际组织，它缺乏国际教育、科学、文化的组织”,所以选B

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