题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。I did not go on my first hike until my mid-30s. I could blame it on the fact that I grew up on the Great Plains of South Dakota and North Dakota. But mostly, to be honest, I just wasn't interested. I went on my first hike a few years back while living in Vernont. At the urging of my wife, and with my two young kids, we walked a beautiful forest path on a cool August morning. When we reached the top, we ate lunch together overlooking a perfectly still pond and a scenic Ve一个数被a除商7余3，这个数可表示为3a+7．…______．