A
The beach may seem like an inviting place to run on a cool summer morning，but is running on the sand good for your body? It can be，but it's important to know the challenges that some beach runners experience.
Running on the beach can be a good thing.It's certainly different from running on the pavement or a track.For starters，sand can be a challenge because it has an uneven (不平坦的) surface.As you push off，you're going to lose some of your push as the sand moves.So，you're not going to be able to push yourself forward as you would on a track or a pavement.But this unevenness has an upside:_It gives your body an extra workout，forcing you to exercise muscles that don't get as much use during runs on firm surfaces.For instance，your feet，ankles and lower back might feel sorer and more tired than usual after a beach run just because that surface is constantly moving and changing step to step.
You also might feel sore afterward because beaches tend to slope (倾斜) down to the water.If you're going for a long run on the beach，you might notice that one side of your body might feel sorer because you're putting more pressure on it due to the slope.
Some beach runners prefer to run barefoot.However，if you're not used to barefoot running，start slowly and don't run long distances at first.That's because running barefoot uses different muscles than running with shoes does，and it's important to strengthen these muscles and adapt (使适应) your feet.If you want to run barefoot，it's great，but ease into it.
In spite of these challenges，running on the sand can be a smart choice for you，because running on softer ground surfaces can reduce muscle damage.
【语篇解读】 语篇类型是说明文，主题语境是健康。作者分析了沙滩跑步对身体的挑战和益处，给初跑者提出了一些建议。
1．Why is it difficult to run on the beach?
A．The soft surface makes people fall over easily.
B．It takes much effort to run on its moving surface.
C．People need to run carefully on its uneven surface.
D．It's hard to keep one's balance on its sloping surface.
B [推理判断题。根据第二段中的As you push off，you're going to lose some of your push as the sand moves.So，you're not going to be able to push yourself forward as you would on a track or a pavement...because that surface is constantly moving and changing step to step可知，由于脚下的沙面不断移动，跑步者失去了在硬化的路面上那样向前的冲力，所以，在沙滩上跑步比较费力。]
2．Which of the following best explains “upside” underlined in Paragraph 2?
A．Advantage. B．Reason.
C．Character. D．Challenge.
A [词义猜测题。根据上下文可知，本句前介绍不平坦的沙滩对于初跑者是一项挑战，此处But表示转折，下文介绍沙滩的不平坦恰能让不经常使用的肌肉得到锻炼，由此可知，沙滩的不平坦也是有优点的。]
3．What's the author's attitude to barefoot running?
A．Disapproving. B．Supportive.
C．Doubtful. D．Impersonal.
B [态度判断题。根据倒数第二段最后一句If you want to run barefoot，it's great，but ease into it可知，作者对裸足沙滩跑持支持的态度，只是建议不太习惯裸足沙滩跑步的人要慢慢适应。]
4．What can be a suitable title for the text?
A．Is running on the beach good for your body?
B．Do you need to adapt yourself to beach running?
C．What are the challenges of running on the sand?
D．Why do you feel sore after running on the beach?
A [标题判断题。文章一开头提出is running on the sand good for your body？下文回答了这一问题：尽管沙滩跑步具有挑战，但是身体可以得到额外的锻炼，而且柔软的沙滩会减少对肌肉的损伤。]
