Câu hỏi :

The word “they” in paragraph 2 refers to _________.

A. farmland

B. temples and palaces

C. rice paddies

D. reservoirs and canals

* Đáp án

D

* Hướng dẫn giải

Dẫn chứng:...reservoirs and canals which were annually flooded to capacity by the Mekong River. Once filled, they were used to irrigate ...

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