题干

央视著名栏目《我爱发明》来山西选节目,现有两个素材备选:

素材1:一位农民发明了挖土豆机,效率确实高,至少顶30个人工;而且只需挂在拖拉机后,利用拖拉机本身动力即可,十分方便。

素材2:某青年发明一种机器,可将各种庄家秸秆压制成建筑用墙板,不仅保暖、轻便,还不易燃烧,浇上油都点不着,因为压的瓷实。

假如你是栏目组组长,你决定选择哪一个素材?并说明理由。

上一题 下一题 0.0难度 选择题 更新时间:2019-05-27 06:27:26

答案(点此获取答案解析)

选素材2。理由:减少焚烧秸秆带来的环境污染;变废为宝,节能环保,符合可持续发展战略要求;安全便捷,成本低廉等。较“素材1”更具推广意义。

同类题3

阅读下面短文,从短文后各题所给的A、B、C和D四个选项中,选出可以填入空白处的最佳选项。

    I volunteer some of my time in order to give back just a little of what I am so blessed to have. This month. I had an unbelievable opportunity to 1 my dream, and step out of my 2 surroundings. I volunteered to go to Guatemale (危地马拉) with an eyeglass.

    Our 3 went to a small town in Guatemala. San Augustin. We 4 our tables and packages of pre-made 5in the dirt courtyard of a clinic, get up the Snellen chart on a wall, and began 6 people. Young and old, they came from many of the 7 town. Most had never had an eye exam before.

    They waited for hours8 in the sun, never complaining. If we could help them out with a 9 pair of glasses they would feel deeply 10. Some only left with eye drops or sunglasses, and 11 these people were grateful.

    We saw over a hundred 12 a day and a good part of those we saw got glasses. We 13over and over from people who knew their eyes 14help that they had not gone to a doctor because it was too 15, or had not got the glasses they needed for the same reason. We saw children who were16 out of school because they could not see the17, and we met women who could not see to thread needles, drivers with 18 seeing road signs.

      We are not doctors, and there were several people we could not help. But for those we could, we watched with pleasure as their lives19. What a gift sight is and what a difference it 20to see clearly.