题目

下列实验现象描述不正确的是（   ）A．在空气中加热铝，失去金属光泽，表面变暗B．木炭在氧气中燃烧，发出白光，生成黑色固体C．细铁丝在氧气中燃烧，火星四射，生成黑色固体D．在空气中加热铜片，铜片表面有黑色固体生成 答案：B解析:略阅读理解 　　Old Mr. Black loved shooting bears(熊), but his eyes were not good any more．Several(几个)times he nearly shot people instead of bears, so his friends were always very careful when they went out shooting with him． 　　One day a friend of his wanted to have a joke(玩笑), so he got a big piece of white paper and wrote on it very big litters “I AM NOT A BEAR．” Then he tied(用红或绳系/扎)it to his back and went off．His friends saw it and laughed a lot． 　　But it did not save him, After a few minutes Mr. Black shot at him and knocked(击，打)his hat off． 　　The young man was frightened(受惊吓的)and angry(气愤的) ． “Didn't you see this piece of paper？” he shouted to Mr. black． “yes, I did, ” said Mr. Black．Then he went nearer, looked carefully at the paper and said, “Oh, I'm very sorry．I did not see the word NOT．” 1. Old Mr. Black liked ________ very much． [　　] A. shooting B. shooting bears C. to go shooting with young people D. playing jokes with his friends 2. Mr. Black's eyes were not good any more, so sometimes he ______． [　　] A. nearly shot people B. stopped shooting C. shot no bears D. shot few bears 3. The young friend tied the paper to his back to ______． [　　] A. tell Mr. Black he was not a bear B. make others laugh C. help Mr. Black shoot at bears D. have a joke 4. The word “save” in the third paragraph means ______． [　　] A. take care of B. give some help C. make safe from danger D. make happy 5. Mr. Black shot at the young man because he ______． [　　] A. didn't like the young man B. was angry with the young man C. thought the young man was a real bear D. wanted to have a joke with the young man