单选题
How different is the group of Nevada test participants from their South Pacific counterparts?
A、
The former shows a higher leukemia death rate than the comparison group.
B、
The former shows a lower leukemia death rate than the comparison group.
C、
The former shows a higher death rate than the latter.
D、
The former shows a lower death rate than the latter.
【正确答案】
A
【答案解析】
[解析] 本题可参照最后一段，从中可知A项“前者显示出比对照组的白血病死亡率高”为正确答案。
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