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1450 questions in 145 tests. Each test contains 10 questions.
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Idiom of the Day
get back to (something)
to return to something
I needed a rest before I could get back to my work.
Amazing Science Images You Must See
Auroras Over America
Undulating high over Quebec and Ontario, the northern lights outshine city lights on Oct. 8, 2012. The strong aurora borealis resulted from a sun stormthree days earlier that sent solar particles on a collision course with Earths atmosphere. The interaction excites oxygen and nitrogen molecules 60 to 250 miles (100 to 400 kilometers) up, releasing photons, or light particles.