题目

 The visit of the police was _______ the lost child.    A. connected with                    B. concerned about    C. involved in                       D. joined to 答案：A将有机物的混合物在一定条件下反应：①甲醇与乙醇的混合物与浓硫酸加热得醚；②乙二醇与乙酸酯化得酯；③氨基乙酸和丙氨酸生成二肽；④苯酚和浓溴水反应。所生成的有机物的种类由多到少的顺序是 A. ③②④①    B. ④③②①      C. ③①②④       D. ①②③④