Question 13 is based on the passage you have just heard.

Passage Two

听力原文

        A recent study overturned what we think we know about lying. Most of us have a theory about how to tell if someone is telling a lie. (12) [We may develop that theory from observations of those people we know well and see regularly.] But we tend to generalize what we gather from that unscientific daily research and make it a universal theory. So we might imagine that liars have evasive eyes, or the opposite, they simply stare at you. Or perhaps it is more generally nervous behavior we associate with lies. (12) [Whatever the particular theory, it’s usually based on close observation of people we know.] 

        And we get lots of practice. On average, we’re lied to some 200 times per day. (13) [These are mostly harmless lies,] but lies nonetheless.

        But there’s a problem with our theories, even though they’re based on all this observation. (14) [The average person—you and me—tested rigorously on how well we detect lies fails to do better than chance.] That’s well established over many studies, and lots of attempts by researchers to work out reliable ways to detect lies. It’s even relatively easy to fool lie detectors, the gold standard of lie detection, by training yourself in breathing techniques and symptom suppression.

        Is there any way to get better at detecting lies? The new research offers some surprising advice. (15) [Stop looking and listen instead.] It turns out that if we’re unable to see the face, but rather focus on the voice of the person in question, our accuracy rate improves considerably.

13. What does the passage say about most lies?（关于大多数谎言，短文说了什么？）

解析：D。录音中提到，我们每天听到的谎言大多无害。D项harmless原词复现，符合题意，故为正确答案。

错项排除：A项利用录音中的detect和easy进行干扰，但录音中提到普通人辨别谎言的能力不比碰运气强多少，也就是说辨别谎言并不容易，A项与此内容相悖，故排除。录音中提到大多数谎言是无害的（harmless），但这并不是说其意图是好的，B项语义理解偏差，故排除。C项的groundless在录音中无依据，故排除。