下列反应中，属于取代反应的是（ ）
①CH3CH=CH2+Br2
CH3CHBrCH2Br ②CH3CH2OH 
CH2=CH2+H2O
③CH3COOH+CH3CH2OH
CH3COOCH2CH3+H2O ④ CH3Cl+Cl2→CH2Cl2+HCl
A．①②
B．③④
C．①③
D．②④
答案：B
题目分析：①是加成反应，错误；②是消去反应，错误；③是酯化反应，也是取代反应，正确；④是取代反应，正确。故选项是B。
Debbie got up early last Saturday morning. She wanted 1 in Green Park with some ot her friends. She was very happy about it. 2 she was ready, she got on her bike and left for the park – it was on the other side of the town. Suddenly, as she was riding fast, she 3 sirens (警笛). The sound of the sirens was getting 4 , so Debbie looked 5 her to see what was happening. As a result (结果), she fell off her bike and lay in the middle of the road. Luckily, Debbie wasn’t hurt, 6 a car hit her bike. After the car 7 , two men got out and started running. 8 , a police car stopped next to the same car and three policemen got out and started running after the two men. One of the policemen shouted, “Stop the thieves (贼)!” 9 a policeman came to see Debbie. He thanked her because, in a way, she had helped them 10 .
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