The word “they” in paragraph 2 refers to ____

A

Từ “they” ở đoạn 2 ám chỉ đến.............

A. những bể chứa nước và kênh đào

B. những ngôi đền và dinh thự

C. những cánh đồng

D. nông trại

Dẫn chứng: The temples and palaces of Angkor were constructed around a series of artificial reservoirs and canals which were annually flooded to capacity by the Mekong River. Once filled, they were used to irrigate the surrounding paddies and farmland during the course of the year.

=>Chọn A