单项选择题

According to the passage, the ERP system

A．is a technology framework that combines many resources for efficient operation
B．allows you to find invention information in a more efficient way
C．is not time-consuming to develop at all
D．is the key cornerstone in e-business
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单项选择题
What does It in the last sentence refer to
A．The weather.
B．Christmas.
C．Charlie's feeling.
D．The difference between his life and the lives of the people overhea
单项选择题
All the following statements may account for the sadness felt by Charlie on Christmas EXCEPT______.
A．he had to get up early to work on Christmas morning
B．he felt lonely
C．he had a sense of inferiority
D．he was poor
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