Questions 1-10

LISTENING PART 4
You will hear a biology student talking about water and how much people 
need to drink each day. 
Now listen carefully and answer questions 31 to 40.
Student:
 Hi everyone. My presentation today is looking at drinking water. 
Now, we know that water is a vital nutrient for human life. But exactly 
how much of it do we need to drink? Well, today I’m going to review 
some of the research. 
So, for example, there’s a common idea that we should drink 8 glasses 
of water every day. But researchers say that the 8-glasses-a-day rule is a 
myth. Some people might need more than 8 glasses, some a lot less. The 
only group for whom the rule is useful seems to be the elderly, because 
they don’t always feel thirsty, even when their bodies are actually short 
of water. So for them 8 glasses a day might be a good rough guide. 
OK, let’s look next at what effects water has on the body. One issue of 
interest is weight loss. And there are lots of theories about this. It’s been 
claimed that dieters should drink more at night time, or drink when they 
first wake up, but there’s no research to back this up. But actually, there 
is some evidence from studies to show that subjects who drank a lot of 
water, and then had their meals, lost more weight. But that may only be 
because the water filled them up and reduced their appetites. 
I also read some of the research done by Dr Amaldi, who’s looked in 
depth at this whole issue of drinking water. And one of his studies 
does support the common claim that water is good for the stomach. In