单项选择题A.To help him explain the information to his roommate.B.To help him write a paper.C.To prepare for a test.D.To tell her if the notes are accurate.
单项选择题A.It is a small amount to pay for so much precious metal.B.It is difficult to judge the value of such an object.C.It is reasonable for an object with such an important function.D.It is too high for such a light weight.