问题
选择题
Gases from cars are the air of our cities. [ ]
A. protecting
B. poisoning
C. preventing
D. providing
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Gases from cars are the air of our cities. [ ]
A. protecting
B. poisoning
C. preventing
D. providing
答案：B