皮皮学,免费搜题
登录
搜题
【简答题】
June 8, 2013 Dear Cindy, I’m sorry to hear that Bird Flu (禽流感) is very serious in some parts of the world and some people have got the flu. We must take good care of ourselves and keep away from the disease. Could you tell me what people in China do to keep away from it? Please write to me soon. Yours, Betty July 2, 2013 Dear Betty, I think Bird Flu is very bad. Many chickens, ducks and birds in our country got the disease. Some of them died, but some birds flew away and they might carry germs(细菌) to other places. This is a serious problem. We must do something to solve it. Let me tell you what people have to do to keep away from the disease. * Do morning exercises every day. * Open the windows in the morning. * Wash hands very often. * Eat more vegetables and less meat. * Go to bed early. I think these are good for our health. Do you think so? Yours, Cindy 根据短文内容,选择正确答案。(每小题1分,共5分) 小题1:From the letter we know Cindy comes from _______. A. Canada   B. the U. S. A.     C. China    D. Japan 小题2:Betty wrote her an e-mail to ask _______. A.whether Cindy got Bird Flu B.how to keep away from Bird Flu C.when Bird Flu began to spread传播 D.how Bird Flu spread in Cindy’s country 小题3:A hard problem to fight Bird Flu is _______. A.we don’t have better doctors or nurses B.Bird Flu is serious C.some places are still poor D.birds with the germs will carry germs to other places 小题4:What does the underlined word “solve” mean in Chinese? A.解决 B.分析 C.通告 D.治愈 小题5:From Cindy’s letter, we know _______ is bad for our health. A.washing hands very often B.going to bed late every day C.eating more vegetables and less meat D.opening the windows in the morning
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】资本主义发展的历史趋势是
A.
.市场经济取代计划经济
B.
计划经济取代市场经济
C.
计划经济取代商品经济
D.
社会主义公有制取代资本主义私有制
【单选题】以Na 2 CO 3 作为基准物质标定HCl溶液时,若Na 2 CO 3 中含少量NaHCO 3 ,则标定得到的HCl溶液浓度将( )
A.
无影响
B.
偏高
C.
偏低
D.
不能确定
【多选题】线上公司的劣势有( )。
A.
安全性是影响线上公司发展的主要因素
B.
配送的费用很高
C.
版权保护的问题尤为突出
D.
电子合同存在容易编造、难以证明其真实性和有效性的问题
【简答题】标定HCl溶液时,以甲基橙为例,用Na2CO3作基准物,称取Na2CO3 0.6135g,用去HCl溶液24.96ml。求HCl溶液的浓度。
【简答题】用 0.2036g 无水 Na 2 CO 3 (M =106.0) 作基准物质,以甲基橙为指示剂,标定 HCl 溶液浓度时,用去 HCl 溶液 36.06mL ,该 HCl 溶液的浓度为 mol · L — 1 。
【单选题】用Na2CO3为基准物质标定HCl溶液时,下列情况对HCl溶液的浓度不产生影响的是
A.
用去离子水溶解锥 形 瓶中的 Na 2 CO 3 时,多加了 5. 0 mL 去离子水
B.
烘干 Na 2 CO 3 时,温度控制 300 ℃以上
C.
滴定管未用 HCl 溶液润洗
D.
滴定速度太快,附着在滴定管壁上的 HCl 溶液来不及流下来就读取滴定体积
【单选题】以基准物Na2CO3标定HCl溶液浓度时,如果滴定管未润洗,那么标定结果会()。
A.
偏高
B.
偏低
C.
无影响
D.
不能确定
【简答题】标定HCl溶液时,以甲基橙为指示剂,用Na 2 CO 3 为基准物,用去Na 2 CO 3 0.6135g,用去HCl溶液24.96mL,求HCl溶液的浓度。
【判断题】几何不变的体系才可以做为结构。
A.
正确
B.
错误
【单选题】以Na 2 CO 3 为基准物标定HCl溶液浓度时,滴定管未用HCl溶液洗涤,将引起( )
A.
正误差
B.
负误差
C.
不确定
D.
无影响
相关题目: