2. 外语
  3. Kissing is so common though we rarely ask why humans touch 【M1】______ their lips together to show affection. One obvious answer

Kissing is so common though we rarely ask why humans touch 【M1】______ their lips together to show affection. One obvious answer

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问题     Kissing is so common though we rarely ask why humans touch 【M1】______
their lips together to show affection. One obvious answer is that it
feels good. Densely packed nerve endings make your lips some of
the most acutely sensitive regions of your entire body, and a few 【M2】______
things get them more riled up than a kiss. But where in humanity’s
evolutionary history putting our faces together come to be regarded 【M3】______
as a display of lust, care, friendship and love?
    One of the most compelling hypotheses surroundings the 【M4】______
emergence of kissing in humans and kiss-like behavior in other
species are tied to the widespread practice of passing pre-chewed or 【M5】______
regurgitated food from the mouth of one animal to another. Birds do
it. Chimps do it. Many humans even do it. The pass of food from 【M6】______
one creature to another is certainly an intimate form of interaction.
Though this behavior can be regarded as altruistic is debatable, but 【M7】______
the fact that caring for one’s young and securing a mate are both
crucial to an organism’s ability to pass its genes on subsequent 【M8】______
generations supports the argument that this behavior would be
evolutionarily encouraged.
    The science of kissing is a fascinated thing to think about and 【M9】______
Philematology(the science and study of kissing)is becoming an
increasingly popular area of study, for researchers strive to sort out 【M10】______
the mysteries of love and attraction. Though plenty of unanswered
questions remain, perhaps it’s sufficient to say that kissing remains
an excellent and exciting human pastime.
【M1】
选项
答案though—that
解析 句法错误。这里并没有转折关系，应该用so…that结构。
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