单项选择题

Passage Three Questions 22 to 25 are based on the passage you have just heard.

A．It has to be removed in time by a dentist.
B．It is a rare oral disease among old people.
C．It contains many nerves and blood vessels.
D．It is sticky and colorless film on the teeth.
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单项选择题
A．Looking one’s superior in the eye.B．Keeping one’s arms folded while talking.C．Showing the sole of one’s foot to a guest.D．Using a lot of gestures during a conversation.
A．Looking one’s superior in the eye.
B．Keeping one’s arms folded while talking.
C．Showing the sole of one’s foot to a guest.
D．Using a lot of gestures during a conversation.
单项选择题
A．Tour Ecuador’s Andes Mountains.B．Earn an annual income of $2800.C．Purchase a plot to build a home on.D．Send their children to school.
A．Tour Ecuador’s Andes Mountains.
B．Earn an annual income of $2800.
C．Purchase a plot to build a home on.
D．Send their children to school.
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