Idiom
Which statement about capillaries is correct?

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

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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. To catch a tartar

To deal with a person who is more than one's match
To catch a dangerous person
To trap wanted criminal with great difficulty
None of these
To meet with disaster

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