单项选择题
Obsessed with their research on superconductive material, they were oblivious of the goings-on around them.
单项选择题 Recurrent showers were forecast for the day.
单项选择题 A careful screeningof the disease will lessen the patients" anxiety.
单项选择题 Those infected with the virus of hepatitis B enjoy equal rights underthe provisions of the law.
