Jimmy was a very fat boy. He used to be sad because of his weight （体重）， so he decided to ask a doctor about it. He said to the doctor， “How can I make myself not so fat？ Everybody laughs at me at the school.”
　　The doctor advised him to exercise daily. After a few days， he again went to the doctor and said sadly that though he exercised every day， he couldn’t reduce （减少） his weight， rather， putting on weight.
　　The doctor asked him what exercise he was doing. Jimmy answered， “I go for horse riding every day. The result is that I got weight while the horse lost weight.”
　　The doctor laughed and showed him how to exercise.
　　1. Question： Why was Jimmy not able to reduce his weight？
　　2. Mixed-up Sentence Exercise