单选题
In many cities pedestrians are now much safer because ______.
A、
no traffic is allowed on some streets
B、
traffic is computer-controlled
C、
cars move very slowly
D、
only one way streets are open to traffic
【正确答案】
A
【答案解析】
参见第四段。单词close是“关闭”的意思。
提交答案
关闭