There seems to be a (n)（） relationship between great event and migration.

单项选择题Which of the following groups in NOT mentioned as migrants in the passage（）

A．Farmers.
B．Workers.
C．Settlers.
D．Colonizers.

单项选择题We can learn from the passage that Blackpool used to（）

A．have as many beaches as Luxemburg.
B．have seriously polluted drinking water.
C．boast some imposing seafront sights.
D．attract few domestic holiday makers.