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Questions 17--20 are based on the following story about Einstein’s life. You now have 20 seconds to read Questions 17--20.
When did Einstein begin teaching

A．In 1901.
B．In 1902.
C．In 1910.
D．In 1879.
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What does Dr. Faustick suggest to prevent dental decay
A．Brush your teeth in the morning.
B．Brush your teeth in the evening.
C．Clean your teeth shortly after eating.
D．Have your teeth X-rayed.
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How many unbelievable descriptions in Marco Polo’s book are mentioned in the passage
A．5.
B．3.
C．2.
D．1.
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