Unit 22 Multiple Choice — Coronavirus COVID-19

DEMO MODE:

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INSTRUCTIONS:

INSTRUCTIONS: Select the best definition (or usage) of the key term (or phrase) below.

noun (thing)

Question 1 of 20

Incubation period

A viral respiratory disease of zoonotic origin which first occurred in 2002 in China and killed over 750 people.

The time before an egg hatches into an adult bird.

The period from exposure to showing symptoms of an illness.

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