单项选择题

()discovered the law of the universal gravitation, which is one of the most important discoveries in physics.

A. Kepler
B. Issac Newton
C. Galileo
D. Copernicus

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单项选择题
Northern Ireland is small, but it is significant because of the().

A. the economic problems
B. the political troubles
C. the immigration issues
D. the national identity
单项选择题
Nowadays the Gaelic language, which is an ancient (), is still heard in the Highlands and the Western Isles.

A. Scottish language
B. English language
C. Irish language
D. Celtic language
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