锌粉、铝粉、镁粉的混合物a g与一定量的某浓度的稀硫酸恰好完全反应，蒸发水分后得固体(不含结晶水)b g，则反应中生成的氢气为(　　)

家住莆田的晓冬到新疆哈密市旅游，发现当地的甜瓜比自己家里种的好吃，特别甜。为了找到哈密瓜甜的主要原因，晓冬向有关部门了解到两地甜瓜成熟期气候的一些数据，如表格所示，请帮助晓冬分析哈密瓜更甜的原因。
⑴哈密市白天日照时间长，温度相对高，有利于植物更好的进行____ 作用，制造更多有机物。
⑵哈密市夜间时间短，温度相对低，造成植物____ 作用分解的有机物比莆田的少。
⑶一昼夜下来，哈密瓜体内积累的有机物将____ 莆田甜瓜体内有机物（填“大于”或“小于”）
⑷根据以上材料，请你写出一个让莆田的甜瓜更甜的方案：____ 。

1：10000000的地图，AB两地的图上距离为20厘米，AB两地的实地距离是（    ）

    In 1973, I was teaching elementary school. Each day,27kids1“The Thinking Laboratory.” That was the 2 students voted for after deciding that “Room 104” was too3.

    Freddy was an average4,but not an average person .He had the rare balance of fun and compassion（同情）.He would5 the loudest over fun and be the saddest over anyone's6.

    Before the school year7,I gave the kids a special 8, T-shirts with the words “Verbs Are Your9” on them. I had advised the kids that while verbs（动词）may seem dull ,most of the10 things they do throughout their lives will be verbs.

    Through the years, I'd run into former students who would provide 11 on old classmates. I learned that Freddy did several jobs after his 12 from high school and remained the same 13 person I met forty years before .Once, while working overnight at a store, he let a homeless man 14in his truck. Another time ,he 15a friend money to buy a house .

    Just last year, I was16 a workshop when someone knocked at the classroom door. A woman17 the interruption and handed me an envelope. I stopped teaching and 18 it up. Inside were the “Verbs” shirt and a 19 from Freddy's mother. “Freddy passed away on Thanksgiving. He wanted you to have this.”

    I told the story  to the class. As sad as it was, I couldn't help smiling. Although Freddy was taken from us, we all20something from Freddy.