Why did the author think the mother was a real hero?
查看答案
翻译句子一旦玛丽下定决心，就绝不会动摇。(waver)
What happened to the plane the author took that Friday morning?
How did the passengers’ reaction change with the development of the situation?
翻译句子他在会上提出了一系列可能避免环境污染的措施。(ward off)
微信支付 
支付宝支付