单项选择题

What does the word "deteriorated" mean (in the last line of paragraph 2 )

A．Weakened
B．Improved
C．Depreciated
D．Decline
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单项选择题
No one realized the cause of the deterioration of the world agricultural commodity market because ______.
A．there was a long interval between cause and effect
B．the weather was difficult for us to forecast
C．weather forecasts were inaccurate
D．ecologists didn't exist until modem times
单项选择题
According to the passage, the effects of Tempura's eruption were ______.
A．of several days' duration worldwide
B．felt mainly in the Dutch East Indies
C．evident in the decreased world temperature
D．immediately evident to the world's scientists
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