单项选择题

Water has become "cool" in the Minneapolis school district partly because ______.

A．water is provided free
B．most kids can afford nothing but water
C．water machines are put in noticeable positions
D．children have realized the harm of sugary drinks
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单项选择题
What can we learn about the result of the latest study
A．There was a significant difference in total deaths from cancer between the two groups.
B．There was no significant difference in death rates between the two groups.
C．The comparison group has a lower death rate.
D．More veterans died from leukemia than from other cancers.
单项选择题
The latest study includes a comparison made between ______.
A．healthy veterans and unhealthy veterans
B．nuclear test participants and those with no radiation exposure
C．the veterans who are still alive and those who have died
D．people who died of cancer and people who took part in atomic tests
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