A-A+ The smog may be so thick that airports are clo 2022-08-06 21:03:53 问答库 阅读 181 次 问题详情 The smog may be so thick that airports are closed and chains of ________ occur on the highways.[A] conflicts[B] contracts[C] contrasts[D] collisions 参考答案 参考答案：D
