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1450 questions in 145 tests. Each test contains 10 questions.
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Idiom of the Day
run across (someone or something)
to meet someone unexpectedly, to find something unexpectedly
I ran across an old friend in the library. I ran across an interesting story in today's newspaper.
My Account / Test History
Fact
Several varieties of lightning have been identified by meteorologists. In the so-called "Positive Giant" type, the temperature of the lightning bolt reaches 30,000 degrees Celsius, over five times hotter than the surface of the sun. .. More >>
Several varieties of lightning have been identified by meteorologists. In the so-called "Positive Giant" type, the temperature of the lightning bolt reaches 30,000 degrees Celsius, over five times hotter than the surface of the sun. .. More >>
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