问题
160,80,40,20,（) A.1／5B.1C.10D.5
160, 80, 40, 20, ()
A.1/5
B.1
C.10
D.5
请帮忙给出正确答案和分析，谢谢！
Fatal error: Uncaught [XSException] ../../../usr/local/xunsearch/sdk/php/lib/XS.php(2559): Connection refused(C#111, localhost:8384)
thrown in /usr/local/xunsearch/sdk/php/lib/XS.php on line 2559
