单项选择题

Questions 15 ～ 18 are based on the following conversation. How many years has it been since the last outbreak of foot-and-month disease in South Africa

A．Over 40 years.
B．Over 20 years.
C．Over 30 years.
D．Over 50 years.
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单项选择题
Why did the government use comics during the war
A．To increase the adult market for comics.
B．To encourage sales of a domestic product.
C．To enhance the confidence of the troops.
D．To try to develop a better form of entertainment for the troops.
单项选择题
Which does NOT explain that laughter helps relieve pain according to Dr. William Fry
A．Laughter makes them forget the pain.
B．When we stop laughing, these muscles relax.
C．When we laugh, muscles are activated.
D．The cycle of laughing and stopping laugh makes muscles relax and relieve the pain.
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