People living in the desert choose to keep their ancient lifestyles and customs people in

问题补充：

People living in the desert choose to keep their ancient lifestyles and customs, people in cities throw away their cultural traditions.

A. when

B. if

C. unless

D. while

答案：

A. when

B. if

C. unless

(答案→)D. while

解析：考查连词辨析。A当…时；B如果；C除非，如果…不…;D当…时；然而；句意：生活在偏远地区的人们选择保存古代的生活方式和风俗。而生活在城市里的人把文化上的传统都抛弃了。根据句意说明本句的while表示的是轻微的转折。故D正确。