Test # 31
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760 questions in 76 tests. Each test contains 10 questions.
Idiom of the Day
old-fashioned, not new or different
My job has become old hat and I am now tired of it.
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Astounding Facts about the human body
Astounding Facts 17
There are 2.5 trillion (give or take) of red blood cells in your body at any moment. To maintain this number, about two and a half million new ones need to be produced every second by your bone marrow.That s like a new population of the city of Toronto every second.