question 4

require 'nokogiri'

html = Nokogiri::HTML(<<-HTML)
  <div class="listing">
    <div class="row">
      <span class="left">Title:</span>
      <span class="right">The Well-Grounded Rubyist</span>
    </div>
    <div class="row">
      <span class="left">Author:</span>
      <span class="right">David A. Black</span>
    </div>
    <div class="row">
      <span class="left">Price:</span>
      <span class="right">$34.99</span>
    </div>
    <div class="row">
      <span class="left">Description:</span>
      <span class="right">A great book for Rubyists</span>
    </div>
    <div class="row">
      <span class="left">Seller:</span>
      <span class="right">Ruby Scholar</span>
    </div>
  </div>
HTML

result = {}
rows = html.css(".listing .row")
rows.each do |row|
  key = row.css(".left").text
  value = row.css(".right").text
  result[key] = value
end

p result
# => {"Title:"=>"The Well-Grounded Rubyist",
#     "Author:"=>"David A. Black",
#     "Price:"=>"$34.99",
#     "Description:"=>"A great book for Rubyists",
#     "Seller:"=>"Ruby Scholar"}