【正确答案】 C

【答案解析】[解析] 30-32
Over time, the custom of kissing developed as a way for adults to express their love and affection for one another. (30) The roots of this form of affection can be traced back to primitive times, when mothers kissed their children, much as mothers do today.
Much later, in the sixth century, society apparently accepted the custom of kissing between adults as expression of their affection. Not surprisingly, France first accepted kissing in courtship. There, figure dancing was popular, and each dance was sealed with a kiss.
(31) The custom of kissing swept from France through Europe to Russia, where Russian nobles loved to imitate the French. Eventually, the kiss was incorporated into marriage ceremonies, and today lip-locks couples into sweet marriage.
(32) The custom of kissing today, as well as in ancient times, serves to pay or show respect to one another. For example, early Romans kissed each other on the mouth or on the eyes to greet one another in a manner they thought to be dignified. One Roman emperor even ranked a person's importance by the body part he was allowed to kiss. He allowed important nobles to kiss his lips, less important ones to kiss his hands, and the least important ones to kiss his feet.
In Russia, the highest sign of recognition from the Crown meant kiss from the Tsar himself. Today, natives of many African tribes pay tribute to their Chief by kissing the ground over which he has walked.
Q: What is the origin of the custom of kissing?

[答案详解] 文中提到接吻的根源可以回溯到原始时期母亲亲吻自己的孩子。故C)项正确。

【正确答案】 D

【答案解析】[解析]
Q: Which of the following statements is true about the custom of kissing?

[答案详解] 文中提到接吻的习俗由法国传遍欧洲到了俄国，俄国贵族喜欢模仿法国人。故D)项正确。

【正确答案】 A

【答案解析】[解析]
Q: What is the social function of the custom of kissing today?

[答案详解] 文中提到现在接吻的习俗是向别人表示敬意。故A)项正确。