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

Passage Two

听力原文

        (12) [Research shows that a few moments of conversation with a stranger creates a measurable improvement in mood.] But most of us are reluctant to start these conversations because we presume the opposite. In an experiment, commuters who talked to nearby strangers found their commute more enjoyable than those who didn’t. They were asked to predict whether they’d enjoy the commute more if they conversed with other people. Intriguingly, most expected the more solitary experience to be more pleasurable. Why is this? (13) [Social anxiety appears to be the problem. People’s reluctance to start conversations with nearby strangers comes partly from “underestimating others’ interest in connecting”.]

        The sad thing is that people presume that a nearby stranger doesn’t want to converse and don’t start a conversation. Only those who forced themselves to chat because it was required by the experiment found out what a pleasant experience it could be. Human beings are social animals. Those who misunderstand the impact of social interactions may not, in some context, be social enough for their own wellbeing. You should be chatting with the strangers you encounter. You may occasionally have a negative encounter that might stick in your memory. (14) [This is because the human brain is biased to dwell on negative events.] But starting conversations with strangers is still well worth the risk of rejection.

        It may surprise you that conversing with strangers will make them happier, too. (15) [The pleasure of connection seems contagious.] People who’re talked to have equally positive experiences as those who initiate a conversation.

13. What prevents people from starting a conversation with strangers?（是什么阻止人们开始与陌生人交谈？）

解析：A。录音中提到一个设问句：这（this）是为什么呢？根据前面的录音可知，this指的就是人们不愿意与陌生人交谈这一情况，而后面紧接着给出答案：社交焦虑似乎是问题所在。A项原词复现，符合题意，故为正确答案。

错项排除：B项Excessive caution、C项的social skills在录音中都无依据，故均可排除。D项利用录音中出现的solitary进行干扰，但录音中是针对人们通勤中的体验，大多数人认为越孤独的体验越愉快，并没有说偏好独处会阻止人们与陌生人交谈，故D项排除。