单项选择题

Questions 32 to 35 are based on the passage you have just heard.

A．Building a floodgate at the entrance of the city.
B．Piping the water back to sea.
C．Pumping seawater into the ground beneath.
D．Put more sand under the city.
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单项选择题
According to the passage, which one is irrelevant to the finding of John Burn’s study
A．Aspirin may offer a simple way to control stems cells that make tumors grow.
B．Aspirin may influence the survival of aberrant stem cells in the colon.
C．Aspirin may damage faulty stem cells before their mutation.
D．Aspirin may reduce the risk of developing colon cancer by blocking the COX-2.
单项选择题
According to the passage, the work of raising children ______.
A．can be learned from others
B．should be under certain instruction
C．usually makes parents lose confidence
D．hasn’t got a fixed pattern
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