单项选择题

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
A．They have been buried in sand.
B．People have been buried in sand.
C．It doesn’t rain often in Egypt.
D．The Egyptian government has protected them from harm.
单项选择题
When do most child poisonings happen
A．When the child can walk.
B．Aged from eight to nine.
C．Aged from four to six.
D．Aged from one to three.
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