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    surface

    1)n．the outside or top of something

    e．g．More than 70％ of the earth ________ is covered by water．

    2)n．what is clean in the situation and not hidden

    e．g．The level of staff unhappiness only came to the ________ when they started to leaving the company．

    3)adj．surface mail：letters and parcels that travel by land and sea

    e．g．Most of the letters are ________．

    4)v．to come to the top of a body of water

    e．g．She ________ to take in air．

    答案：1)surface;2)surface;3)surface letter;4)surfaced
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