“520”是什么？探究这个数字的含义和浪漫
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1 . What makes people less focused according to the passage?
A.
Lack of water.
B.
Being sharp enough.
C.
The important advice.
D.
A new research.
2 . When will the cognition problems begin to happen from Paragraph 2?
A.
The moment when people have drunk enough water.
B.
The time when people suffer from mental side effects.
C.
The time when people just feel slightly thirsty.
D.
The moment when people have the severe dehydration.
3 . How soon will the dehydration level reach 2% when exercising in the summer heat?
A.
In 30 minutes.
B.
Within 50 minutes.
C.
After 100 minutes.
D.
150 minutes later.
4 . What should people do when their brain isn’t running well?
A.
Have a debate.
B.
Drink some water.
C.
Wash the hands.
D.
Change the topic.
