Idiom
Which statement about capillaries is correct?

Their walls are covered with cilia
Their walls are only one cell thick
They warm and humidify inhaled air
They move mucus through the lungs

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. I raked my brains to solve this difficult problem.

I used my common sense
I subjected my mind to hard thinking
I brainwashed several experts
I read number of books
I consulted several people

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