Chinese Political History II: Chapter 4, Exercise 3 — Possible Solution
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TASK
"China had a firm two-term limit and a retirement age of 68 for everyone."
Separate what the chapter supports, what it does not, and rewrite it.

WHAT THE CHAPTER SUPPORTS
- Jiang gave up the party post in 2002 and the presidency in 2003; Hu did
  so in 2012 and 2013, having gained the CMC chair in 2004.
- The constitution limited the presidency to two terms; the 2018 removal of
  that limit is covered in Chapter 7.

WHAT IT DOES NOT SUPPORT
- "Firm two-term limit": the sources here document the presidential limit
  only through its 2018 removal. They do not show a firm two-term rule for
  party posts.
- "Retirement age of 68": the informal "seven up, eight down" age norm was
  not confirmed by the sources I checked, and "for everyone" is not shown.
- Jiang kept the CMC for two years after leaving the party post, which
  does not fit "everyone retires at once."

REWRITE
"In this period two leaders handed over their party and state posts at
the end of about two terms each, and the presidency had a two-term limit
in the constitution that was removed in 2018. Some observers describe an
informal age rule as well, but this chapter could not verify it."