Have you ever wondered how acceptable it is to hug or touch someone? While it may sound safe to avoid all physical contact so as not to offend any one, the lack of touching might imply cold attitudes or indifference in interpersonal relationships.

        So, what should we do? The simple answer is to thoroughly learn unique cultural norms for physical contact. In nonverbal communication terminology (术语), physical contact and the study of touching are generally referred to as haptics.

        Haptics in communication often suggest the level of intimacy. They are usually classified into two groups: high-contact and low-contact.

        Asia and quite surprisingly the United States, Canada and Britain belong to low-contact cultures. People from the rest of the world, such as Latin America, are considered to be in high-contact cultures, where they tend to expect touching in social interactions and feel more comfortable with physical closeness. Despite the classification, there are more complex factors such as relational closeness, gender, age, and context that can affect how someone views physical contact.

       One common French custom of greetings is cheek-kissing, but it is mostly restricted to friends, close acquaintances and family members. While cheek-kissing for Latin Americans is also a universal greeting form, it does not require such a high degree of relational closeness. However, gender matters more for them because cheek-kissing often only happens between women or a man and a woman but not two men.

        In contrast, in certain Arabian, African, and Asian countries, men can publicly hold hands or show physical affection as signs of brotherhood or friendship while these behaviors may suggest a romantic relationship in other parts of the world. Although men’s touching is more normal in these cultures, physical contact between persons of opposite sexes who are not family members is negatively perceived in Arabic countries.

        These factors could definitely affect the degree to which someone is comfortable with tactile (触觉的) communication and physical intimacy. Therefore, if you are someone who loves to show physical affection, you should not be afraid to show it or drastically change your behaviors—just ask for consent beforehand!

解析：D。根据题干中的physical contact和communication可定位至文章第二、三段。第三段提到，交流中的触觉（haptics）通常暗示亲密程度，触觉在第二段中提到过，是指在非语言交际术语中，身体接触（physical contact）和针对触摸的研究，由此可知，交流中的触觉即交流中的身体接触。D项与此内容相符，How close the communicators relationships are是对句中the level of intimacy的同义替换，故D项为正确答案。

错项排除：A项中的social class在文中无依据，故排除。文章中虽然多次提到culture，但这只是再说高接触和低接触文化，并不是说人们的文明程度（civilized），B项曲解文意，故排除。文章中虽然提到来自法国、拉美、阿拉伯、非洲和亚洲国家的人，但并没有说身体接触可以显示出人们的家庭背景，故C项错误。