26.What is Jianping Huang concerned about?
A.The rapid growth of the foreign species.
B.The fast losses of native plants and trees.
C.The war for water between trees and humans.
D.The quickly declining rainfall in the dry areas.
27.What has the forestry department learned from the tree-planting effort?
A.To put economic value first.
B.To consider the income of all parties.
C.To base its decisions on local conditions.
D.To wait for complete scientific evidence.

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