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
网友回答
A. when
B. since
(答案→)C. while
D. because
解析：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。