Rapid run-off would cause frequent floods and leave little water during dry seasons.
A. sometimes
B. unusual
C. irregular
D. little
Giải bởi Vietjack
Đáp án đúng là: B
Giải thích: frequent (a): thường xuyên >< unusual (a): bất thường
Dịch: Nước chảy xiết có thể gây lũ lụt thường xuyên và chỉ để lại ít nước trong mùa khô.
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