题干

某化学研究小组的成员经过学习得知,Cl2与H2O发生下列化学反应,并且HClO具有比Cl2更强的氧化性.Cl2+H2O⇌HCl+HClO

他们为了探究新制饱和氯水的组成和性质而进行了科学实验:先观察了氯水的外观性质以后,又用胶头滴管将该氯水逐滴滴入含有酚酞的KOH溶液中,边滴边振荡,并连续观察现象,发现溶液的红色逐渐褪去而得无色溶液.以下的问题需要请你来配合回答:

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同类题5

根据短文内容,从A、B、C、D四个选项中选出一个能填入相应空格内的最佳答案。

The Bone in Throat

    Once upon a time, there was a lazy wolf living in a forest. Near his house was a pond. Many animals came to 1 to drink water. The wolf was always there in search of food.

    One day, he was sitting near the pond, hoping to get something 2. When suddenly he saw a dead bull, “Aha! What a luck! Now I can eat all I want.” he thought and his 3started watering.

    He began to eat the bull. A thought came into his mind, “if 4 beast comes this way, he will ask for a share. I had better eat 5.” ‘Grub! Grub! Grub!' he chewed, faster and faster. Suddenly, a piece of bone stuck in his throat. “Ohh! Errk!” cried the wolf. He tried to pull it out of his mouth. He tried to cough it out but it didn't 6 . Next, he tried to swallow (吞) it down but he failed.

    “Ooh, the bone in my throat hurts me. What 7 I do now?” thought the wolf. Soon he remembered that a crane (鹤) lived on the nearby river bank.

    The wolf went to the crane and pleased, “My dear Crane! I have got a bone stuck in my throat. I will give you a present 8 you pull it out of my throat.” The crane took pity on the wolf. He asked the wolf to look up 9 his mouth open. The crane then put its head into the wolf's mouth and pulled out the bone. “Oh! What a relief!” the wolf said. “Now where is my present?” asked the crane. “What present?” the wolf replied, pretending not remembering its promise. “You said that you would give me a present if I removed the bone from your throat,” said the crane angrily. “Hah! Isn't it a present that you put your head into my mouth and got out 10? I could have easily broken your head while your head was inside my mouth.”