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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单项选择题
One comparison mentioned in the last paragraph was made between ______.
A．Pacific test participants and those who undertook the Nevada test
B．Nevada atomic veterans and those who didn't take part in any nuclear tests
C．Veterans in Nevada and Pacific atomic tests and the comparison group
D．half of Nevada test participants and half of the group of no test participants
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.
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