單選題

　　[填句補文]The typical person living alone is neither old nor lonely. ________. The majority of these people have chosen to live alone. They are responding to decreasing social pressure to get married and have a family.

　　A、This is a dramatic change from the extended families of just a couple of generations ago.

　　B、The growing number of women with good jobs has done much to increase the number of people living alone.

　　C、There‘s more pressure to get married nowadays.

　　D、In fact， a quarter of the 23 million single people in the U.S. are under the age of 35.