单项选择题

A simple blood test may help identify those ______ high risk of dying from heart disease.

A. in
B. on
C. at
D. for
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单项选择题
The full impact of the recent tsunami caused by an earthquake in Japan is ______ to predict.
A. unlikely
B. impossible
C. unable
D. incapable
单项选择题
Seawater near the Fukushima plant is showing elevated levels of radioactivity in Japan.
A. stabilized
B. reduced
C. increased
D. saturated
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