单项选择题

Questions 11-13 are based on the passage you have just heard. What is the finding of the new study of aspirin

A．It has been proven to be the best painkiller.
B．It is a possible cure for heart disease.
C．It can help lower high body temperature effectively.
D．It reduces the chance of death for heart surgery patients.
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单项选择题
What social scientists have long felt puzzled about is why______.
A．the mortality rate can not be predicted
B．the death toll remained stable year after year
C．a quota for each type of death has not come into being
D．people lost their lives every year for this or that reason
单项选择题
What do we learn from the conversation
A．Alice didn’t seem to be nervous during her speech.
B．Alice needs more training in making public speeches.
C．The man can hardly understand Alice’s presentation.
D．The man didn’t think highly of Alice’s presentation.
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