单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．7 years.
B．9 years.
C．12 years.
D．16 years.
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单项选择题
A．Taking off his shoes.B．Washing his hands in a pool.C．Washing his hands in a stone basin.D．Bowing to the hosts.
A．Taking off his shoes.
B．Washing his hands in a pool.
C．Washing his hands in a stone basin.
D．Bowing to the hosts.
单项选择题
A．Planktons are too small to be seen.B．Most planktons have transparent tissues.C．Most planktons are practically invisible to predators.D．Planktons are fascinating organisms.
A．Planktons are too small to be seen.
B．Most planktons have transparent tissues.
C．Most planktons are practically invisible to predators.
D．Planktons are fascinating organisms.
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