According to the article, what causes ear discomfort while flying？
A change in air pressure.
B. A change in drinks.
C. A change in plane speed.
D. A change in temperature.
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According to the e-mail, what does Mr. Collins want to do？
A. Change the location of an event
B. Reschedule a meeting with Ms. Park
C. Purchase plane tickets to Seoul
D. Visit a plant in Osaka
What is stated about Rainbow Paint？
A. It was developed 20 years ago.
B. It comes in seven types of colors.
C. It is susceptible to harsh weather conditions.
D. It is available at a single location in the Riverstone vicinity.
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