单项选择题A.there is a definite relationship between high levels of lead and death.B.the patients with brain tumors have higher levels of lead in their bones.C.some workers have higher risks of developing brain cancers than others.D.higher levels of lead have a long-term effect on children over a lifetime.
单项选择题A.looking at the mirror.B.practicing simulated interviews.C.practicing answering questions.D.finding some of your strong points.