单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Which place is the dirtiest one

A．A toilet seat.
B．A toilet door handle.
C．A keyboard.
D．A desk.
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单项选择题
Which of the following titles is the best one for the passage
A．Digging for gold.
B．Famers and his three sons.
C．Finding hidden gold.
D．Making wealth through adventur
单项选择题
What’s the moral of the story
A．Every part of the body debated to be the boss of the body.
B．Asshole is the most important part of the body.
C．One doesn’t need brains to be a boss—any asshole will do.
D．Other parts of the body actually are more important than asshol
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