单选题
How did Dr. Griffiths discover the gamblers' feelings when winning and losing?
A、
By examining the different chemicals in gamblers' bodies.
B、
By asking the gamblers to speak aloud their feelings.
C、
By asking the gamblers to discuss their ideas.
D、
By testing the gamblers' heart beat.
【正确答案】
B
【答案解析】
[解析] 细节推断题。题目询问格里菲思医生如何获知赌博者输赢时的想法。答案在第三自然段第二句：在实验中，常赌博的人和不常赌博的人都把赌博时的想法说出来。
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