单项选择题
After two years' research, we now have a（）better understanding of the disease.
A.veryB.farC.fairlyD.quite
单项选择题 It’s based on the idea（）all people are created equal，（）is accepted by most people.
单项选择题 Barack Obama，（）African America，was elected as（）56th President of the United states.
单项选择题 It is not （）to discuss the questions again and again.
