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In a study of the effect of radiation from nuclear weapons plants on people living in areas near them, researchers compared death rates in the areas near the plants with death rates in areas that had no such plants. ███████ ██ ██████████ ██ █████ ██████ ███ ███████████ █████████ ████ █████████ ████ ███ ███████ ███████ ██████ █████ ██ ██████ ███████ ██ ██████ ██████ ████ █████
7.
Which one of the following, ██ █████ ████ █████████ ███████ ███ ██████████████ █████████
a
Nuclear power plants ████ ███ ████████ ██ ███ ██████
b
The areas studied ███ ███████ █████ █████ ██████ ███ █████ ███ ███████ ███████ ██████ ████ ██████
c
Exposure to nuclear █████████ ███ █████ ████ ███████ ████████ ████ ██ ███ ███████████ ██████ ██ ██████
d
Only a small ██████ ██ █████ ████ ███████ ███████ ███████
e
The researchers did ███ █████ ███ ████████ ██████ ███████ ██ █████████ ██ ██████ ███ ████ ████████ ██ ███ ███████ ███████ ██████ ██ █████ █████████ ███ ███ ████ ██ ███ █████ ██████