题目

As the world watched the twin towers of the World Trade Center come under attack,a common phrase was repeated:“It looks like a movie.”  1  The attack destroyed one of the world’s highest skyscrapers and left 5000 people dead or missing.  2 .The Empire State Building,the White House,New York City and even the American president himself have all been threatened(威胁) by terrorist attacks in these exciting films. The film“True Lies”,released in 1994,is considered to be a good example of this kind of movie. 3  “Independence Day”in 1996 took this 某同学采用硫铁矿焙烧取硫后的烧渣（主要成分为Fe2O3、SiO2、Al2O3 ， 不考虑其他杂质）制取七水合硫酸亚铁（FeSO47H2O），设计了如图流程：下列说法不正确的是（　　） A.溶解烧渣选用足量硫酸，试剂X选用铁粉B.固体1中一定含有SiO2 ， 控制pH为使Al3+转化为Al（OH）3 ， 进入固体2C.从溶液2得到FeSO47H2O产品的过程中，须控制条件防止其氧化D.若改变方案，在溶液1中直接加NaOH至过量，得到的沉淀用硫酸溶解，其溶液经结晶分离也可得到FeSO47H2O