题目

在含Fe3＋、Fe2＋、Mg2＋、NH4＋的稀溶液中加入足量BaO2固体，充分作用后，再加入过量稀盐酸，完全反应，离子数目没有变化的是（    ） A．Fe3＋  B．NH4＋       C．Mg2＋ D．Fe2＋ 答案：C 解析:Fe3＋会因Fe2＋的转变而增多。 错因分析：错解B。BaO2会和水反应，生成Ba(OH)2和氧气，忽略NH4＋＋OH－＝NH3·H2O NH3·H2O＝NH3↑＋H2O。My alarm o’clock rings in my ears at 5:00 every morning. On hearing the ring, I will get out of bed and put on my glasses. The house is quiet as I walk downstairs while my husband and three kids sleep in peace. Instead of going for a long run as usual, today I chose my favorite exercise DVD and started moving. Sweat rolled down my face and into my eyes. My heart beat wildly as I face my body to finish each movement before a mirror. Of course I felt extremely tired towards the end, but a smile spread across my face. I smiled because the DVD was over, and there appeared a brighter smile of success from pushing my body to its extreme limit.While some people are fond of chocolate, shopping, smoking, or work, what I need is taking exercise to pass each day. People shake their heads when they see me run with sweating heavily through the town. Some look surprised when I refuse to try just one bite of chocolate cake. They seem greatly puzzled by my “no thank you,” or by my choice to just have a vegetable salad. I have come to realize that it doesn’t matter to just say “No.” to any kind of food that I don’t want to eat.Do you wonder what drives me to roll out of bed at 5:00 a.m. every morning? What makes me refuse ice cream firmly? Commitment—I’m determined to change my life with a way which can not only free me from daily anxiety, but also increase energy and self–confidence. And above all it will surely help me to keep good body shape and maybe extend my life. This is the real reason why there’s a huge smile spreading across my face when I look at myself in the mirror or try on my favorite pair of jeans that now fit me just right and look perfectly on me. I never doubt that I cannot make a difference within myself inside and out without such commitment and sweat.【小题1】From the text we can conclude that the author___________.A．desires to look different from others.B．expects to develop a good body shape.C．has difficulty getting along with others. D．behaves strangely every morning she gets up【小题2】Which statement is TRUE according to Paragraph 2 ?A．Others don’t understand the author.B．Others help the author by offering her food.C．The author doesn’t understand others.D．The author hates to make others surprised.【小题3】The underlined word “commitment” in the last paragraph refers to ________.A．good healthB．firm beliefC．a habitD．a permission【小题4】Why is there a smile on the author’s face in the morning?A．Because she sees her family sleeping peacefully.B．Because she finishes her favorite exercise. C．Because she enjoys the inspiring DVD music.D．Because she feels a sense of achievement