题目

_____ French teenager killed in the bombing on Feb. 28 was on a school trip with several dozen classmates, many of them wounded, _____ mayor of her hometown said yesterday. A. A; the      B. The; the       C. The; /     D. A; the   答案：B ①向试管里添加石灰水时，先将 取下， 在桌面上，手握试剂瓶时，注意 然后瓶口紧挨试管口倾倒．②点燃酒精灯加热要用 ，熄灭不能用嘴吹应该 ，某同学加热试管后试管炸裂，可能的原因有 ， （两条）