Choose THREE letters, A-G. Write your answers in boxes 7-9 on your answer sheet. Which THREE of the following seven piec

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问题     Choose THREE letters, A-G.
    Write your answers in boxes 7-9 on your answer sheet.
    Which THREE of the following seven pieces of safety equipment are suggested for use with a hot air balloon?
    A.Drop line
    B.Gas valve
    C.Piezo ignition
    D.Synthetic clothing
    E.Fire-proof gloves
    F.Flint spark lighter
    G.Propane combustion
A dry envelope helps to stop the growth of ______ on the material.

选项

答案mould

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