def METHOD_NAME(LCClient):
    mock_qr = mock_query_object(LCClient)
    qrshow0 = mock_qr.show()
    qrshow1 = mock_qr.show('Start Time', 'Instrument')
    allcols = {'Start Time', 'End Time', 'Instrument', 'Physobs', 'Source',
               'Provider', 'Resolution', 'Detector', 'url'}
    assert not allcols.difference(qrshow0.colnames)
    assert qrshow1.colnames == ['Start Time', 'Instrument']
    assert qrshow0['Instrument'][0] == 'GBM'