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
Which of the following is not a form of gambling
A．Horse racing.
B．Casinos.
C．Playing cards.
D．Lotteries.
单项选择题
The author feels that Americans lack_______.
A．understanding
B．self-confidence
C．a rebellious spirit
D．self-control
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