28 The city plans to restrict the use of firefighting containing certain chemicals that could contaminate groundwater.
(A) forum
(B) foam
(C) faucet
(D) flare
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統計: A(34), B(168), C(89), D(35), E(0) #2355266
統計: A(34), B(168), C(89), D(35), E(0) #2355266