单项选择题

According to the experts, when should travelers read and listen to safety instructions()

A. Before takeoff.
B. In an emergency.
C. Throughout the flight.
D. During landings.

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Which of the following would be the best title for this passage()

A. A Valuable Metal—Gold
B. Looking for Gold
C. Jewelry and Coins
D. What is Karat
单项选择题
She is always easy to get along with, but she is difficult to understand ()

A. at one time
B. at a time
C. at times
D. at all times
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