每個空格對應(yīng)一個序號，有A、B、C、D四個選項(xiàng)，請選擇一個最恰當(dāng)?shù)倪x項(xiàng)作為解答。
    ●In the following essay，each blank has fourchoices．Choose the best answer and write down on thean，swer sheet．
    Microwave communication uses(1)frequency radio waves that travel instraighdine sthroughthe air．Because the waves cannot(2)with the curvature of the earth，they can be (3)onlyover short distance．Thus，microwave is a good(4)for sending data between bulldingsin a city or on a large college campus．For longer distances，the waves must berelayed by means of“dishes”or (5)．These can be installed on towers，highbuildings，and mountain tops．
    (1)A．high
    B．10w
    C．1ong
    D．short
    (2)A．reflex
    B．distort
    C．bend
    D．a(chǎn)bsorb
    (3)A．transmitted
    B．transformed
    C．converted
    D．delivered
    (4)A．material
    B．equipment
    C．medium
    D．channel
    (5)A．repeaters
    B．radars
    C．telephones
    D．a(chǎn)ntennas