单项选择题

Questions 17～20 are based on the following passage. You now have 20 seconds to read questions 17～20. Which of the following statements about the rattlesnake is untrue

A．The rattlesnake is a dangerous snake.
B．The rattlesnake’s rattles are rings of hardened skin.
C．The rattlesnake is the only species of snake that has rattles.
D．The rattlesnake is one of many poisonous snakes that give warning before they strike.
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单项选择题
When did Ali announce that he had become a Black Muslim
A．He announced that he had become a Black Muslim after defeating Liston in a championship fight.
B．He announced that he had become a Black Muslim while he was still an amateur boxer.
C．He announced that he had become a Black Muslim after the Vietnam War.
D．He announced that he had become a Black Muslim when he retired form boxing in 1980.
单项选择题
What happened to Ali when he refused to enter the United States Army during the Vietnam War
A．He spent five years in prison.
B．He was accepted into the Black Muslim religious group.
C．He was denied his boxing rights.
D．He was immediately exempted from military, service.
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