题型：问答题 简答题 完形填空。Dear Cindy, My name is Benny Hu. I am 13 years old. I live in Beijing. My 1 are listening to music and playing computer games. I also like playing football. You are 2 favourite star. I like your songs very much. I think you act and 3 very well. I hope to become a famous person 4 you and travel around the world. I like you 5 you are a very generousperson－you always give money to the 6 and homeless people around the world. You are also verysmart and you 7 a lot about the world around you. I 8 you in Hong Kong last year. I like your big smiling eyes. I would be very happy if you could 9 me a photo with your signature. Thank you for 10 the time to read my letter. Benny Hu ( ) 1. A. hobbies ( ) 2. A. I ( ) 3. A. sing ( ) 4. A. as ( ) 5. A. and ( ) 6. A. young ( ) 7. A. ask ( ) 8. A. see ( ) 9. A. send ( ) 10. A. take B. friends B. me B. sings B. with B. because B. rich B. know B. seeing B. pass B. taking C. lessons C. my C. singing C. for C. so C. poor C. take C. will see C. lend C. took D. secrets D. mine D. to sing D. like D. if D. happy D. hear D. saw D. hand D. to take 查看答案
题型：问答题 简答题 设阿伏加德罗常数的数值为NA，下列说法正确的是（ ）A．1L1mol•L-1的FeCl3溶液中含有NA个Fe3+B．3.4gNH3中含N-H键数目为0.6NAC．2.24LCO2与足量的Na2O2反应，Na2O2转移的电子总数一定为0.1NAD．常温下，2.7g铝片投入足量的浓硫酸中，铝失去的电子数为0.3NA 查看答案
题型：问答题 简答题 Thanks ______ the Great Green Wall, the land produces more crops.[ ]A. by B. of C. for D. to 查看答案
题型：问答题 简答题 为验证pH对唾液淀粉酶活性的影响，实验如下：（1）操作步骤：①在1~5号试管中分别加入0.5%的淀粉2 mL 。②加完淀粉液后，向各试管中加入相应的缓冲液 3.00 mL，使各试管中反应液的pH依次稳定在5.00、6.20、6.80、7.40、8.00。③分别向1~5号试管中加入0.5%唾液1 mL，然后进行37℃恒温水浴。④反应过程中，每隔1分钟从第3号试管中取出一滴反应液，滴在比色板上，加一滴碘液显色，待呈橙黄色时，立即取出5支试管，加碘液显色并比色，记录结果。 （2）结果见下表 12345pH5.006.206.807.408.00结果（颜色）+++橙黄色+++（1）实验过程为什么要选择37℃恒温？（2）3号试管加碘液后出现橙黄色，说明什么？（3）如果反应速度过快，应当对唾液做怎样的调整？ （4）该实验得出的结论是什么？ 查看答案