单项选择题

Dr. Griffiths's research helps you find out ________.

A．which group of gamblers played the game better
B．a chemical to increase gamblers' heart beat
C．a way to help gamblers give up gambling
D．when gamblers should be given drugs

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单项选择题

According to the text, what do we know about non-regular gamblers

A．Their bodies produce less endorphins during the game.
B．They don't consider losses in a game as reasonable near wins.
C．Their bodies have no reaction to beta blockers.
D．They have faster heart rates during the game.

单项选择题

The underlined words a high probably mean ________.

A．a feeling of happiness
B．a reasonable thought
C．a great expectation
D．an exciting idea