Premise:
"Como itself is a large factory town famous for its centuries-old silk production, but it has a handsome Gothic-Renaissance cathedral crowned by a superb Baroque dome that was added in 1744 by Turin's great architect, Filippo Juvarra."
Hypothesis: There are ten silk-making factories located in Como.

it is not possible to tell

Premise:
"Thank you, sir, said Adrin, tipping his hat."
Hypothesis: Adrin was wearing a hat.

yes

Premise:
"Words hissed from his lips in a stream of sibilants too quick for Dave to catch."
Hypothesis: He was using an incantation.
it is not possible to tell