Walnuttrees__________environmentstressessuchasdroughtbyproducingsignificantamountsofasubstancesimilartoaspirin.
A.turn to B.confirm to C.contribute to D.respond to正确答案D
Walnuttrees__________environmentstressessuchasdroughtbyproducingsignificantamountsofasubstancesimilartoaspirin.
A.turn to B.confirm to C.contribute to D.respond to正确答案D