显性基因控制的性状能够表现出来，隐性基因控制的性状不能表现出来。（     ）

能源、环境与人类生活和社会发展密切相关．

（1）目前，人类以化石燃料为主要能源，常见的化石燃料包括煤、石油和____ ．

（2）为减少污染、提高煤的利用率，可将其转化为两种可燃性气体，此过程可认为是碳与水的反应，其微观示意图如下所示：

①写出该反应的化学方程式____ ．

②该反应生成物的分子个数比为　____ ．

（3）为减少温室气体排放，人们积极寻找不含碳元素的燃料．经研究发现NH₃燃烧的产物没有污染，且释放大量能量，有一定的应用前景．

①NH₃中氮元素和氢元素的质量比为____ ．

②将NH₃燃烧反应的化学方程式补充完整4NH₃+3Ｏ₂6H₂O+____ ．

在生态系统中，能量的最终来源是（    ）

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Jimmy started painting when he was four years old. When he was six, he was already very good at it. He 1 many beautiful and interesting pictures, and people 2 a lot of money for them. They said, “This boy's going to be 3when he's a little older, and then we're going to 4  these pictures for a lot more money. Then we will get rich.”    

    Jimmy's pictures were 5 from other people's because he never painted on the whole piece of  6. He painted on half of it, and the other half was always 7.

  “That's very clever,” everyone said. “8 else does that!”

    One day somebody bought one of Jimmy's 9 and then said to him, “Please tell me this, Jimmy. Why do you paint on the 10half of your paper, but not on the top half?”

  “Because I'm small,” Jimmy said, “and my brushes don't reach very high.”