单项选择题
The English abstract of your thesis leaves much to be desired , so you have to rewrite it.
单项选择题 Obsessed with their research on superconductive material, they were oblivious ofthe 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.
