Nhận biết (M1)

A unique habitat at the interface of surface water and groundwater within river corridors, a river's hyporheic zone (HZ) extends beyond its embankments: for a great river like the Brahmaputra, the HZ might reach up to 400 meters from the channel. Because of its inaccessibility, scientists use __________ to measure the HZ—for example, by mapping aquatic organisms found in soil beyond a waterway's banks.

Which choice completes the text with the most logical and precise word or phrase?

• A.

  simulations

• B.

  proxies

• C.

  auxiliaries

• D.

  parameters