Premise:
"Situated at the eastern end of Shikoku, across the Inland Sea from Kurashiki and Okayama, is Takamatsu, another friendly provincial town where foreigners seem to receive a particularly warm welcome."
Hypothesis: Takamatsu's people are friendly to foreigners because they are used to a lot of tourists.

it is not possible to tell

Premise:
"The fakes are best distinguished from the genuine articles by how low a price you can get."
Hypothesis: The likelihood of an article being fake is supposedly directly correlated to how low a price you can get on it.

yes

Premise:
"The Department of Defense, alone, has a vast information infrastructure that includes 2.1 million computers and over 10,000 networks that are used to"
Hypothesis: There are 2.1 million computers included in the Department of Defense's information infrastructure.
yes