Researchers are developing low-cost devices. These devices can detect water pollutants in rivers and lakes.

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Researchers are developing low-cost devices. These devices can detectwaterpollutants in rivers and lakes.

Researchers are developing low-cost devices that can detect water pollutants in rivers and lakes.

Researchers are developing low-cost devices to detect water pollutants in rivers and lakes.

Researchers are developing low-cost devices so that they can detect water pollutants in rivers and lakes.

Researchers are developing low-cost devices who can detect water pollutants in rivers and lakes.

Giải thích

Đápán: A

Giảithích:

-Đạitừquanhệ “that” thaythếchodanhtừchỉvật “devices” trướcnó

- Đápán B, C sainghĩa

- Đápán D sửdụngđạitừquanhệ “who” sai do “who” thaythếchodanhtừchỉngười

Dịch: Các nhànghiêncứuđangpháttriểncácthiếtbịgiárẻcóthểpháthiệncácchấtgây ô nhiễmnước ở sônghồ.