【正确答案】 C

【答案解析】[听力原文]
   Figuring out whether the man or woman you're with is the ever-elusive "one" is no mean feat. But, if a new checklist is to be believed, it's rather simple to work out. According to a study, couples who talk about bodily functions, have access to each other's passwords and shower together are the most committed. Planning a holiday, driving each others' cars and having a key to your partner's fiat are other signs that a relationship has got serious. Researchers asked couples on the different stages of their relationship to determine the top signs that show a couple are past the "seeing each other" phase and taking things into more serious territory.
   Posting a "loved-up" photo on Facebook, changing your status to "in a relationship" and being introduced to wider friendships circles also show couples are the "real deal". Meeting potential in-laws, staying overnight and opening salary details also prove that couples are the "real deal". The study also highlighted that couples deem a relationship more serious when they get more comfortable with each other—which means seeing each other without make-up, showering together, walking around the house in pajamas and even discussing intimate health issues and bodily functions. Other relationship milestones include meeting the parents, becoming the "plus one" on all invites, seeing each other through an illness and comfortably phoning each other at work. Buying a dog or cat together, choosing their partner's favorite foods in the weekly food shop and sharing their friends secrets are also sure signs that you're with the one, according to the research by Monarch.
   What can we learn about from the passage?
选项A是人生是一场长途旅行，选项B是有时你要足够幸运才能找到对的伴侣，选项C是几种判断你的恋人是否认真对待你们关系的方法，选项D是找到你爱的人是一件很难的事。由选项可知，该问与文章主题有关。
   文中提到去真正了解你的另一半的多种办法，例如告知对方自己的身体状况、知晓对方的密码，并且与其一起沐浴。此外，假期计划二人出游、开对方的车、有对方公寓的钥匙也可以反映出双方对待这段关系的认真态度。故选C。