OG 12 18 求教！

阳光袭卷城市 · 发表于 2019-11-9 11:46:16

In Asia, where palm trees are nonnative, the trees` flowers have traditionally been pollinated by hand, which has kept palm fruit productivity unnaturally low. When weevils known to be efficient pollinators of palm flowers were introduced into Asia in 1980, palm fruit productivity increased-by up to 50 percent in some areas-but then decreased sharply in 1984.

Which of the following statements, if true, would best explain the 1984 decrease in productivity?
A Prices for palm fruit fell between 1980 and 1984 following the rise in production and a concurrent fall in demand.
B Imported trees are often more productive than native trees because the imported ones have left behind their pests and diseases in their native lands.
C Rapid increases in productivity tend to deplete trees of nutrients needed for the development of the fruit-producing female flowers.
D The weevil population in Asia remained at approximately the same level between 1980 and 1984.
E Prior to 1980 another species of insect pollinated the Asian palm trees, but not as efficiently as the species of weevil that was introduced in 1980.

想问一下这道题的A选项，虽然我做对了，但是当时有纠结A选项TAT

AlanHeeee · 发表于 2019-11-10 02:11:31

价格和需求变化，和产量的变化无关

OG 12 18 求教！

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