The three most common 16 for road running events are 10K runs, half marathons (21.1K), and marathons (42.2K).
答案：(B) distances
distances（距離）呼應後文10K runs, half marathons, marathons 等具體距離單位，表示這是路跑賽事最常見的三種距離；journeys／destinations／measurements 均不符合此處語意。
10K、21.1K、42.2K 這些數字看起來就是量出來的數值，measurements（測量值、尺寸）於是顯得很合理，這是本題最誘人的選項。
空格填的是一個概括詞，而清單就緊接在後面：10K runs, half marathons (21.1K), and marathons (42.2K)。遇到「概括詞加清單」的句子，判準只有一句——清單裡那幾樣東西的共同點是什麼，空格就填什麼。三樣並列的東西共同點很清楚：都是「跑多遠」，也就是距離，所以填 distances。整句讀成「路跑賽事最常見的三種距離是十公里、半程馬拉松與全程馬拉松」，也緊扣住這一篇的核心軸線：整篇都在講 road running 這項運動怎麼分類、誰能參加。
measurements 指的是量出來的數值或尺寸本身（the measurements of the room），著眼在「測量」這個行為與結果；但這一句在講的是賽事的分類方式，賽事是按跑多遠來分的，英文講賽事規格用 distance。journeys（旅程）強調的是移動的過程與經歷，路跑不是在講旅程。destinations（目的地）是終點的地點，路跑賽事不是以「跑到哪裡」來分類的，何況同一場賽事常常起點與終點相同。這一格的鑑別度 51，分開的是有沒有停下來確認清單裡那三樣東西到底共同在講什麼。
distance（距離）、a 10K run（十公里路跑）、half marathon（半程馬拉松）、as opposed to（而不是、與……相對）、paved road（鋪面道路）、accessible（容易接觸到的、門檻低的）
Road running is one of the most popular and accessible athletic activities in the world. It refers to the sport of running on paved roads or established paths as opposed to track and field, or cross country running. The three most common 16 for road running events are 10K runs, half marathons (21.1K), and marathons (42.2K).
Road running is unique among athletic events because it 17 all ages and abilities. In many cases first time amateurs are welcome to participate in the same event as running club members and even current world-class 18 . Sometimes it may also include wheelchair entrants.
Road running often offers those 19 a range of challenges such as dealing with hills, sharp bends, rough weather, and so on. Runners are advised to train prior to participating in a race. Another important factor contributing to success is a suitable pair of running shoes.
Road running is often a community-wide event that highlights or raises money for an issue or project. 20 , Race for the Cure is held throughout the U.S. to raise breast cancer awareness. This race is also run in Germany, Italy, and Puerto Rico.