现有①五氧化二磷，②空气，③铁粉，④氯化亚铁，⑤液态氧 ⑥水，⑦氯化钠，⑧金刚石，其中属于单质的是____；属于化合物的是____；属于氧化物的是____．

上海某中学的同学逐一罗列出太阳灶造价高、工艺复杂、笨重(50千克左右)、携带不方便等缺点，提出改进的设想，明确了主攻方向，终于发明了只有4千克重、拆装方便、便于携带的“无基板充气太阳灶”。该项发明获第三届全国青少年科学发明创造比赛一等奖。

材料主要体现的思维发散技法是( )

爆发于西非国家的埃博拉疫情已导致近2万人感染，死亡7588人，埃博拉病毒与动物细胞相比最主要的不同是（ ）

从1，2，3，4中任取2个不同的数，则取出的2个数之差的绝对值为2的概率是(     )

完形填空
    A few years ago, I took a sightseeing trip to Washington D.C. I saw many of our  1  treasures, and I also saw a lot of   2  people like beggars and homeless folks in the streets.
    Standing outside the Ronald Reagan Center, I heard a voice say, “Can you help me?” When I turned around, I saw an elderly   3 woman with her hand extended(伸出). In a natural reaction, I reached into my pocket, pulled out all of my loose change and   4  it on her hand. I didn't even look at her. I was  5  at being troubled by a beggar.
     6 the blind woman smiled and said, “I don't want your money. I just need help finding the post office.”
    Immediately, I realized what I had done. I  7  with prejudice(偏见)—I judged another person simply for what I   8  she was.
    The thing I had forgotten about myself is 9  I am an immigrant(移民). I left Honduras and arrived in America at the age of 15   10   the years, I have been a dishwasher, cashier, mechanic and pizza delivery driver among many other 11, and finally I became a network engineer.
    In my own life, I have experienced many open acts of prejudice. I remember a time, at age 17—I was a busboy, and I heard a father told his little boy that if he did not do well at school, he would   12  like me.
    But now, living in my American middle-class lifestyle, it is too easy to forget my past, to forget who I am and where I have been, and to lose sight of 13  I want to be going. That blind woman on the street of Washington D.C. cured me of my  14  . She reminded me to always keep my eyes and heart   15 .