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On March 20 1 1 year, the strong earthquake in Japan caused the natural rubber futures price to fluctuate greatly. This phenomenon mainly reflects the influence of () on the futures market.
Answer: a, d

The sharp fluctuation of natural rubber futures price caused by the strong earthquake in Japan mainly reflects the psychological factors of investors and the influence of natural rubber demand fluctuation after the earthquake on the futures market. Item B, Japan is not a natural rubber producing area, which will not affect the supply; Item C, there is no correlation between crude oil price and natural rubber after the earthquake.