Bộ 5 đề thi giữa kì 2 Tiếng Anh 9 Global Success có đáp án - Đề 3

Why is it necessary sometimes to keep the water level high?

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Why is it necessary sometimes to keep the water level high?

To produce electricity.

To prevent floods.

To let barges float downstream.

To change the flow of water.

Giải thích

Chọn A.