现行教学大纲把小学阶段的识字量规定为（）字左右，掌握这些常用字能够满足小学生日常（）的需要。
参考答案：2500；读写
We should pay close attention to safety in schools because of frequent reports about accidents ____ students got injured or killed while in school.
A．which
B．for which
C．in which
D．what
恶性肿瘤向肺内转移最易出现的X线表现是
A．弥慢性线妆及小颗粒阴影
B．弥漫性蜂窝状阴影
C．多发肿块影
D．支气管炎样斑状影
E．单发大肿块影
