如图所示的“化学多米诺实验”，打开分液漏斗的活塞A，可观察到D_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

如图所示的“化学多米诺实验”，打开分液漏斗的活塞A，可观察到D中的液体沿导管流进C，在C中反应产生一种能使带火星木条复燃的气体．请回答以下问题：

（1）B中发生反应的化学方程式______；

（2）C中发生反应的化学方程式______．

答案

（1）二氧化碳气体与氢氧化钠溶液接触后，发生反应生成碳酸钠和水，装置内二氧化碳气体被流入的氢氧化钠溶液所吸收；

故答案为：CO₂+2NaOH=Na₂CO₃+H₂O；

（2）由于试管C内的二氧化碳气体的减少而使压强减小，试管D内无色液体流入试管C内而与黑色固体接触而产生氧气，根据实验室制取氧气的反应，试管C内发生的反应为过氧化氢在二氧化锰催化下分解生成氧气和水；

故答案为：2H₂O₂

MnO2

.

2H₂O+O₂↑．

完形填空

When I came to my new school three years ago, I was surprised at how lonely I felt. Then one of my classmates invited me to her house for a dinner 36 . I was a little anxious, but finally I gladly 37.
Not really knowing how 38 the bus ride should be, I 39 when I saw the landmarks 40 on my friend’s hand-drawn map. But when I got close enough to the 41 , I found none of the streets were shown on the map. I was 42 on a busy road with cars driving past without a person in sight. I had no43 when the next bus would come, 44 when a bus did come by, I 45 got on. I told the bus driver where I wanted to go and he said that I had caught the 46 bus, but he let me stay on. After he had finished his scheduled bus route, he 47 to help me out. I gratefully showed him my little hand-drawn map but 48 did not help much.
He finally 49 me off at a main road to catch a different bus and was 50 that he could not help me more. After a few minutes of walking, I noticed a bus pull up beside me. It was the 51 bus driver. He explained that he didn’t want to leave me there 52 . He sent out a call and someone radioed back, saying that the bus I needed to catch was about ten minutes away. At last I made it to the dinner party 53 I was over an hour late.
I am forever thankful for the 54 that this bus driver had for me. His act of kindness left a 55 on my heart.

B．walked away

A．street signs

B．tall buildings

C．traffic lights

D．disappointed

C．unaccompanied

单项选择题

中毒性痢疾合并脑病：（）

A.脑膜刺激征阳性

B.皮肤有出血点

C.呕吐、脓血便

D.惊厥停止后神志即恢复正常

E.肢体瘫痪