单项选择题A.It is too high for such a light weight.B.It is difficult to judge the value of such an object.C.It is a small amount to pay for so much precious metal.D.It is reasonable for an object with such an important function.
单项选择题A.To make friends through groups.B.To learn more about other people’s ideas.C.To offer a chance to discuss with a specialist.D.To present to students information not found in books.