阅读理解
One of my best friends went abroad to enjoy her holidays, so the job of looking after her dog Missy has been given to me. A few months ago, Missy came to my friend's house. She looked terrible. She has been abused for a long time.
When we first visited my friend and Missy, my friend had to gently pull her over on a lead (牵绳) to get her to come to us. She wanted to come but afraid to do so—the poor, beautiful thing. Clearly Missy came to the right home. My friend has given birth to a baby of his own and shows the love of a mother. This is just what Missy needs. Thanks to the love of my friend, she has changed into a new dog step by step. Sadly, she is still afraid of strange humans. I hate to imagine what the dog must have gone through.
Now, Missy trusts me completely, so I can touch her berry（肚皮）.While standing, she will jump up so gently to be closer to me, putting her paws（爪子）on my legs as she looks at me with those beautiful eyes.
Missy is really brave. She has the courage to try again, to open her hearts, and to know that not everyone is the same kind of people as before. Keep it in mind that tomorrow is another day.
，已被广泛应用于声、热、光的传感等方面，它是由CH三CH、(CN)2、CH3COOH三种单体通过适宜的反应形成的。由X的结构简式分析合成过程中发生反应的类型有( )