【题目】Walking is cheap, safe, enjoyable and environmentally friendly. ________, it is good for us.
A.If soB.On the other handC.In a wordD.To give an example
在线课程【答案】C
【解析】
考查短语辨析。句意：步行既便宜、安全、愉快又环保。总之，它对我们有好处。A. If so如果是这样的话；B. On the other hand在另一方面；C. In a word总之；D. To give an example例如；举例。根据句意，对前面进行总结，故选C。