5 câu hỏi
What does the writer find difficult about snorkelling?
doing it in tropical seas
explaining the technique to a beginner
describing how exciting it can be
doing it for the first time
A swimmer should________before diving with a snorkel.
take a deep breath
take two deep breaths
take repeated deep breaths
take much physical exercise
Why is taking a deep breath before diving a mistake?
You will not be able to dive deeply enough.
You will not be able to float properly.
You will use up too much oxygen.
You will lose consciousness.
Snorkellers should wear shoes while diving________.
to protect their feet cut from sharp rocks
to protect them from the rays of the sun
in order not to become infected
in order not to lack oxygen
The general impression of snorkelling the writer gives is that________.
it is extremely dangerous
many people who do it suffer from oxygen shortage
you have to buy special clothes in order to do it
most swimmers can learn to do it
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