单项选择题

鼻塞初起多为实证，日久以虚证或虚实夹杂为多。
A、正确
B、错误

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单项选择题

“Doth God exact day-labor, light denied”. Where does this line of poetry come from? (Week 3)

A．John Donne’s “A Valediction Forbidding Mourning.”
B．John Milton’s Sonnet 19 (“When I consider how my light is spent”)
C．John Milton’s Paradise Lost.
D．William Shakespeare’s Sonnet 18 (“Shall I compare thee to a summer’s day”)

单项选择题

‏取冻精时，冻精脱离液氮的时间不超过（）秒。‍
A、5
B、10
C、20
D、30