通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。

     One day when some people were rebuilding a barn (谷仓), they found a mouse hole in a corner. So they used smoke  the mice to come out. A while later they indeed saw mice running out.
     Then, everyone thought that all the mice had escaped. But as they were just about to start to , they saw two mice squeezing at the exit of the hole. The strange thing was that they did not run away . Instead, one chased after the other near the exit of the hole. 

     Everyone was, so they stepped closer to take a look. They realized that one of the mice was  and could not see anything, and the other one was trying to allow him to bite on his tail so they could escape .
     After  what had happened, everyone was speechless and . A smart Israeli said, “I think the relationship between those two mice is husband and wife.” The others thought for a while, and all felt it , so they expressed their agreement. Therefore, the expression on the Israeli's face showed .
     A Chinese, who was accustomed to the firm tradition of loyalty to parents, said:“I think the relationship between those two mice is that of mother and son.”  the others thought for a while, and felt this was more reasonable.
     At that moment, one  Samaritan who was squatting (蹲) on the ground resting his chin in his palms, looked at other people, and asked, “Why do those two mice have to have a certain relationship?”
     Suddenly, the atmosphere . Shocked, the group looked back at the Samaritan and remained . All the people who had spoken earlier all lowered their heads in shame, and did not dare to respond. 

     In fact, the true love is not  benefit, friendship and loyalty or blood relationship. Instead, it is based on no relationship.