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单项选择题

A．Fat.B．Protein.C．Sugar.D．Oil.What does the bacteria in……

Questions 11—13 are based on the following passage. You now have 15 seconds to read Questions 11—13.
What does the bacteria in plaque live on



A．Fat.
B．Protein.
C．Sugar.
D．Oil.
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单项选择题Why can some pyramids built thousands of years ago remain well preserved

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