阅读下面短文，掌握其大意，然后从1－15各题所给的a、b、c和d项中，选出最佳选项，并将答案涂在答题卡标号为1－15的相应位置上。
how can you tell if someone’s lying? the answer is, they’re probably not. traditional economics says that people are 1 beings who will lie if it’s to their advantage. a recent university study has shown that, actually, we’re pretty 2 — especially when we’re at home.
researchers in germany 3 people at home and asked them to toss (投掷) a coin. there was a strong 4 incentive (刺激) to lie about the result: if the coin landed tails-up, the participant would receive money, while if the coin landed heads-up, they would get nothing. because they were on the phone, they knew there was no 5 of getting caught if they lied.
and yet people told the 6 . over hundreds of tosses a coin will land tails-up about 50% of the time. in this 7 over half the people asked (55.6%) said that the coin landed heads-up, which meant they would receive nothing.
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