早晨,下起了蒙____(mēng mēng)蒙细雨,空气变得____(情 清 青)冷了,田野里的____(情 清 青)草重新变绿了,可是他的心____(情 清 青)却变得越来越沉重了。
下列关于实验安全的说法正确的是()
— Sorry, I didn't pass the exam, and then what should I do?
—I think perhaps you should be careful next time.