The Isle of Man lies in the Irish Sea, between the north of England ____ Ireland. It ____ (become) separated from Britain and Ireland by 6500 BC. It is a____ (self-govern) dependency （属地） of Britain, and its parliament ____ (date) back to Viking times over a thousand years village____There are 22 local authorities on the Isle of Man, consisting ____ 4 town, 2 district, 2 village and 14 parish authorities. However, the British government has final authority and the Queen is Head of State. The Isle of Man has____ own currency and a very low rate of tax, so it is popular with rich people and banks and financial businesses. Road-racing is very popular and attracts____ (thousand) of visitors, especially to the motorcycle races in May and June. A type of cat____ (find) on the island, called “Manx” cat, is famous for having no tail. The ____ (office) symbol of the Isle of Man, used on the flag, is a circle with three legs attached.

假如你是生活在距今约7000年长江流域的原始居民，你不可能看到下列哪一现象(    )