TPO 23综合写作：听力转述
None of the causes in the reading passageis adequate.
(1)The chemical on healthy treeshelps them resist insects. Therefore, the plague of the beetles can’t be thefundamental reason.
(2)The island with no bear alsosees the decline of the tree population, rooting out the possibility of thebear being the culprit.
(3)Low elevation is warm but moretrees actually died here instead of in high altitude places. So we should lookaway from the frost damage for the cause.
