4 CÂU HỎI
What does the writer find difficult about snorkelling?
A. doing it in tropical seas
B. explaining the technique to a beginner
C. describing how exciting it can be
D. doing it for the first time
A swimmer should________before diving with a snorkel
A. take a deep breath
B. take two deep breaths
C. take repeated deep breaths
D. take much physical exercise
Why is taking a deep breath before diving a mistake?
A. You will not be able to dive deeply enough.
B. You will not be able to float properly.
C. You will use up too much oxygen.
D. You will lose consciousness.
The general impression of snorkelling the writer gives is that________.
A. it is extremely dangerous
B. many people who do it suffer from oxygen shortage
C. you have to buy special clothes in order to do it
D. most swimmers can learn to do it
