It is very _____ for a person to know how fast a car is traveling.(横线填空）
题目
It is very _____ for a person to know how fast a car is traveling.(横线填空）
六年级（第二学期）YLE P60页的选词填空题(understand，careful，fall down，difficult，within)
答案
difficult
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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