Portugal gave Macau to China on _______.

A. 20 December, 1997
B. 20 December, 1998
C. 20 December, 1999
D. 20 December, 2000

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Which scientist discovered the radioactive element radium?

A. Isaac Newton

B. Albert Einstein

C. Benjamin Franklin

D. Marie Curie

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Which is the poorest country with a lowest per capita income in the world?

A. Senegal

B. Brunei

C. Burundi

D. Bhutan

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