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

<上一题目录下一题>

热门试题

单项选择题

Which of the following was the cause of cold weather in England from 1815 to 1818

A．England' s proximity to the North Sea
B．Volcanic ash in the atmosphere
C．Floorings in the area
D．Pollution caused by the International Revolution

单项选择题

We can infer that the author of this passage ______.

A．disapproves of Rooseveh's "New Deal"
B．thinks the Depression could have been avoided
C．blames the Depression on the "Great Crash"
D．feels there was some similarity between Roosevelt and Hider