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1300 questions in 130 tests. Each test contains 10 questions.
Idiom of the Day
call on (someone)
to ask someone to participate in something or contribute something
The teacher called on me three times to answer questions in the class.
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Nathan Wolfe Virus Hunter
As director of the Global Viral Forecasting Initiative (GVFI) Wolfe spends most of his time in remote regions of Africa and Asia taking blood samples and tracking down viruses before they make the jump from animals to humans. Its not exactly the safest job in the world, but millions of people are glad he does it.