单项选择题

The author's tone is _______

A．guardedly warning
B．angry
C．optimistic
D．gloomy
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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
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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