...
<sec id="sec45">
 ...
 <question-wrap>
  <question id="q1" question-response-type="multiple-choice">
   <label>1</label>
   <p>Where was the first permanent English 
    settlement in the New World?</p>
   <option correct="no">
    <label>A</label>
    <p>Plymouth</p>
   </option>
   <option correct="yes" id="q1b">
    <label>B</label>
    <p>Jamestown</p>
   </option>
   <option correct="no">
    <label>C</label>
    <p>Roanoke</p>
   </option>
  </question>
  <explanation pointer-to-explained="q1b">
   <p>Established by the Virginia Company of London, Jamestown 
    was the first permanent English settlement in the New World; 
    it flourished from 1607 to 1699.  Although the Roanoke colony 
    was founded earlier (in 1587), that colony failed; upon returning 
    from a trip to England for supplies, its Governor found the 
    settlement abandoned.  Although one of the earliest New England 
    colonies, Plymouth (in modern Massachusetts) was not founded 
    by the Pilgrims until 1620.</p>
  </explanation>
 </question-wrap>
</sec>
...

...
<sec id="sec45">
 ...
 <question-wrap>
  <question id="q2" question-response-type="true-false">
   <p>Peregrine White was the first English 
    child born in North America.</p>
   <answer pointer-to-question="q2" id="ans2">
    <p>False</p></answer>
  </question>
  <explanation pointer-to-explained="ans2">
   <p>The first English child born in North America was 
    Virginia Dare.  She was born in August 1587, in the 
    short-lived colony of Roanoke.  Although the settlement 
    was later abandoned and the fate of its inhabitants a 
    mystery, records brought to England by her grandfather, 
    the governor of the colony, later in 1587 note her birth 
    and baptism.  Born in November 1620, Peregrine White 
    was the first child born in the Plymouth colony.</p>
  </explanation>
 </question-wrap>
</sec>
...

...
<sec id="sec45">
 ...
 <question-wrap>
  <question id="q2" question-response-type="multiple-choice">
   <p>Peregrine White was the first English 
    child born in North America.</p>
   <option correct="no">
    <p>True</p></option>
   <option correct="yes" id="q2b">
    <p>False</p></option>
  </question>
  <explanation pointer-to-explained="q2b">
   <p>The first English child born in North America was 
    Virginia Dare.  She was born in August 1587, in the 
    short-lived colony of Roanoke (NC).  Although the settlement 
    was later abandoned and the fate of its inhabitants a 
    mystery, records brought to England by her grandfather, 
    the governor of the colony, later in 1587 note her birth 
    and baptism.  Born in November 1620, Peregrine White 
    was the first child born in the Plymouth colony (MA).</p>
  </explanation>
 </question-wrap>
</sec>
...

...
<sec id="sec45">
 <title>The Answers</title>
 <p>Students should use the answers below to check
  their understanding.</p>
 <answer-set>

  <answer pointer-to-question="q1">
   <p>B</p>
  </answer>

  <answer pointer-to-question="q2" id="ans2">
   <p>false</p>
   <explanation pointer-to-explained="ans2">
    <p>Soviet cosmonaut Georgy Beregovoy was born three months
     and three days earlier than United States astronaut John 
     Glenn, whose birth date is July 18, 1921.</p>
   </explanation>
  </answer>

  <answer pointer-to-question="q3">
   <answer-set>
    <answer pointer-to-question="q3a" id="ans3a">
     <p>1</p>
    </answer>

    <answer pointer-to-question="q3b" id="ans3b">
     <p>3</p>
    </answer>

    <answer pointer-to-question="q3c" id="ans3c">
     <p>2</p>
    </answer>

    <explanation pointer-to-explained="ans3a ans3b ans3c">
     <p>Glenn resigned from NASA on January 16, 1964. He 
      won election to the United States Senate in 1974. On 
      October 29, 1998, he became the oldest person to fly 
      in space.</p>
    </explanation>
   </answer-set>
  </answer>

  <answer pointer-to-question="q4">
   <p>This selection is a biographical sketch of John Glenn's 
    career.  The sketch focuses upon his achievements at NASA, 
    notably his becoming the first American to orbit the Earth 
    in 1962.  The biography also discusses his retirement from 
    the Marine Corps and subsequent election to the United
    States Senate, where he continued his interest in space 
    flight.  The bio concludes with his participating at age 77 
    in a Space Shuttle mission.</p>
  </answer>

 </answer-set>
</sec>
...

...
<sec>
 <title>Demonstration Test Teacher's Notes</title>
 <explanation pointer-to-explained="ans2">
  <p>The text says "Glenn is the earliest-born American to go to 
   orbit, and the second earliest-born man overall after Soviet 
   cosmonaut Georgy Beregovoy, who was born three months and three 
   days earlier." Since Georgy Beregovoy was born before John Glenn, 
   Beregovoy was the older man.</p>
 </explanation>
</sec>
...