题目

某混合物X由Al2O3、Fe2O3、Cu、SiO2中的一种或几种物质组成．进行如下实验．试回答：（1）经I得到蓝色溶液，该过程中一定发生的化学反应是（用离子方程式表示） 、 ．（2）X中一定含有的物质是 ．反应II的化学方程式是 ．（3）为进一步确定上述混合物X的成分，另取9.08g X进行如下实验．①加入足量的NaOH溶液，过滤，将滤渣在氮气气流中干燥得固体mg．②向滤渣中加入过量盐酸，过滤，将滤渣在氮气气流中干燥得固体n g．由于缺少某步操作，使得测定Last summer Jenny and her friends had a bus trip to New York. She felt very relaxed on the way. They visited a museum. But it was really crowded there and the display(展览) was not interesting at all. They went to different restaurants to have dinner. Some food was quite delicious, but Jenny thought the fast food was awful. When the weather was fine, they went to the beach to swim. The sea was beautiful, and they had a good time.1.Jenny had a bus trip to ____.A. Japan B. the U.S.C. Australia D. England2.They visited ____.A. a museum B. a Beijing HutongC. the White House D. the park3. They thought the display(展览) was ____.A. interesting B. boring C. crowded D. fun4.They ate dinner____.A. at home B. in the museumC. in a restaurant D. at school5.They ____ when it was fine.A. went to swim B. went homeC. visited a museum D. went to a hotel