单项选择题
SALUBRIOUS:（）
A．gradually disabled B．nasty C．unwell D．clumsily handled E．disgusting
单项选择题 LEVITY:（）
单项选择题 In the passage, the author is primarily concerned with（）
单项选择题 Which of the following does the passage imply about the notion that the universe may be based on a spherical geometry（）
