Beijing is ranked first in terms of traffic jams and expenses for culture ________ Guangzhou is more open to peasant workers than Beijing and Shanghai.
A.when
B.since
C.while
D.because
答案:C
C 考察连词辨析。意为:北京的交通堵塞和文化消费位列第一,而广州对于农民工要比北京和上海开放。根据语境可知两句之间是对比转折关系,while表示对比,故C正确。