题目内容
【题目】下列关于NH3性质的说法正确的是( )
A．收集时采用向上排空气法 B．能使湿润的红色石蕊试纸变蓝
C．可用浓硫酸进行干燥 D．不能与氧气反应
【答案】B
【解析】氨气密度比空气小，所以收集时采用向下排空气法，A项错误；氨气溶于水生成一水合氨，电离出氢氧根离子，所以氨气能使湿润的红色石蕊试纸变蓝，B项正确；氨气是碱性气体，与硫酸反应，氨气只能用碱性和中性干燥剂干燥，C项错误；D、氨气与氧气在点燃的条件下生成氮气和水，D项错误；答案选B。
天天练口算系列答案
【题目】请阅读下面文字及图标，并按照要求用英语写一篇150字左右的文章。
1.Hold fast to dreams For if dreams die life is a broken-winded bird That can never fly. Hold fast to dreams For when dreams go Life is a barren field From only with snow | 2.Strong belief is everything in wishing. If you don’t believe in your own power to make your wish come true, your wish will fly away, never to be seen again. If you’re wishing for something possible, then it may be possible for you to do whatever you need to make it come true. The ultimate magic is not wishing, but doing. |
3.Once a teacher received a paper from a boy where he described the dream of owning a 200-acrc horse ranch and a large house. He graded it with a red F, thinking it was an unrealistic dream. Though asked to change it (he boy stated, “You can keep the F and I’ll keep my dream.” Many years later, the boy made it a reality. |
■ 85% have a dream ■ 78% have a dream but give up ■ 7％ have a dream and realize it |
【写作内容】
1.用约30个单词概述上述信息的主要内容；
2.结合上述信息，简要阐述坚持梦想的重要性；
3.谈谈你的梦想 ，并分析实现梦想的必要要素（不少于两点）。
【写怍要求】
1.写作过程中不能直接引用原文语句；
2.作文中不能出现真实姓名和学校名称：
3.不必写标题。
【评分标准】
内容完整，语言规范，语篇连贯，词数适当。
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