Dehydration is a drag on human performance. It can cause tiredness and weaken the endurance among athletes, according to a 2018 study in the journal Frontiers in Physiology. Even mild dehydration can affect a person’s mood or ability to concentrate.
Water is cheap and healthy. And drinking water is an effective way for most people to stay hydrated. The National Academy of Medicine recommends that adult women and men drink at least 91 and 125 ounces of water a day, respectively. But large quantities of water in the morning, at noon and night may not be the best or most efficient way to meet the body’s hydration requirements.
“If you’re drinking water and then, within two hours, your urine output is really high and your urine is clear, which means the water is not staying in well,” says David Nieman, a professor of public health at Appalachian State University and director of the Human Performance Lab at the North Carolina Research Campus. 
Drinking water before or during a meal or snack is a good way to hydrate. “Drinking water with amino acids or fats or vitamins or minerals helps the body take up more of the water, ” he says. Some of his own research has found that eating a banana is better than drinking sports drinks when it comes to post-exercise recovery. 
For those hoping to stay optimally hydrated, drinking slowly and steadily and mixing water with a little food is a more effective method than knocking back full glasses of water between meals. “Water is good for you, but you can drown in it too,” Nieman says.

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1.In the first paragraph, dehydration is mentioned ________.

A to support his view

B to advertise sports drinks

C to introduce the topic

D to explain why dehydration is bad

解析：选C。推理判断题。作者在第一段提及dehydration脱水（症），是为了导入话题，故选C。

2.Lucy’s mother should drink at least _________ ounces of water every day.

A 125 ounces

B 34 ounces

C 91 ounces

D 152 ounces

解析：选C。推理判断题。由第二段The National Academy of Medicine recommends that adult women and men drink at least 91 and 125 ounces of water a day, respectively.可推断露西的妈妈每天应该喝至少91盎司的水，故选C。

3.According to the passage, _________ is a better way to stay hydrated.

A drinking full glasses of water between meals

B drinking little water

C drinking slowly and steadily and mixing water with a little food

D drinking lots of sports drinks

解析：选C。细节理解题。由最后一段第一句可知：那些希望保持最佳补水状态的人，缓慢而稳定地喝水，将水和少量食物混合在一起，比在两餐之间喝下整杯水更有效，故选C。

4.What’s the best title of the passage?

A The definition of dehydration.

B The reason of drinking water.

C The better way of drinking water.

D The importance of drinking water.

解析：选C。主旨大意题。通读全文，文章介绍了怎样喝水是保持水分的更好方法，故选C。