单项选择题

Investors in gambling ventures have found them _______

A．very difficult to handle
B．extremely profitable
C．to cause family problems
D．boring
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单项选择题
The author's tone is _______
A．guardedly warning
B．angry
C．optimistic
D．gloomy
单项选择题
In the US gambling _____
A．is diminishing
B．is gaining acceptance
C．is causing financial damage to investors
D．is being successfully challenged by opponents
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