Answer:
False,it is not the only one.
Explanation:
There are plenty more such as:
- “Sphinx of black quartz, judge my vow”
- ”Jackdaws love my big sphinx of quartz”
- Pack my box with five dozen liquor jugs”
- ”The quick onyx goblin jumps over the lazy dwarf”
And many more
The season must be Fall, we can claim this by looking for key details like "and the leaves were turning gold and red" and "The day was crisp,"
