Premise:
"Their price was $18,000."
Hypothesis: Their price was $1.

no

Premise:
"oh your kidding"
Hypothesis: You are being serious.

no

Premise:
"Sao Vicente, perhaps the prettiest village on the island, begins at the point where the northern coastal road meets the north-south road heading 21 km (13 miles) to Ribeira Brava."
Hypothesis: The prettiest village on the island very well may be Sao Vicente.
yes