题目内容：

Some years ago, a 28­year­old Californian wife and mother of three children died from drinking too much water. Her body was found in her home shortly after she took part in a water­drinking contest that was held by a local radio show. Called “Hold Your Wee For A Wii”， the contest organizers promised a free Wii video game machine to those who drank the most water without going to the bathroom. The woman who died drank about 2 gallons of water during the contest. When she and other participants complained of discomfort and showed signs of pains, they were laughed at by the organizers.

This tragic news story shows the importance of understanding why drinking too much water can be dangerous to your health.

Consuming more water than you need can increase your total blood volume (容量). And since your blood volume exists within a closed system, increasing your blood volume puts unnecessary stress on your heart and blood vessels (血管). Your kidneys (肾) must work overtime to get rid of extra water out of your system. Your kidneys are not a pair of pipes. Flushing more water through your kidneys doesn't necessarily help it become cleaner. Rather, your kidneys can get damaged by unnecessary wear and tear over time. And drowning your system with large amounts of water is one of many potential causes of kidney damage.

Putting unnecessary stress on your system and your kidneys by consuming unnecessary water is an unnoticeable process. For the average person, it is usually impossible to know that this stress exists, as there are usually no obvious symptoms on a moment­to­moment basis. But make no mistake about it: this stress is real and can hurt your health over the long term.

1.Why is the Californian woman mentioned?

A. To lead to the topic of the text.

B. To tell us a tragic news story about a mother.

C. To tell us it can be dangerous to take part in contests.

D. To tell us how much water we can drink at most one time.

2.When the participants showed signs of pains, the organizers ________.

A. became very concerned

B. were laughed at by others

C. tried to reduce their pains

D. didn't pay much attention to them

3.What's the main idea of Paragraph 3?

A. How water is consumed in our body.

B. The importance of water to our health.

C. Why drinking too much water is dangerous.

D. The function of kidneys in consuming water.。

4.The stress caused by consuming unnecessary water ________.

A. isn't that dangerous

B. can never be found out

C. is really harmful in the long run

D. leads to some obvious symptoms