Cork is an excellent material for preparing bottle stopper as it is

Options :
  1. permeable to air
  2. cheaper in cost
  3. easily available
  4. air tight
Answer and Explanation :-

Answer: Option 4

Explanation:

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Deciding whether or not to trust a person is like deciding whether or not to climb a tree because you might get a wonderful view from the highest branch or you might simply get covered in sap and for this reason many people choose to spend their time alone and indoors where it is harder to get a splinter.
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