After doing market research, all the researchers think it ________ to invest a large sum of money

in the project.[ ]

A. worthless  

B. priceless

C. valuable  

D. worthwhile

神经源性膀胱的病因不包括（）。

A.脊髓损伤

B.糖尿病

C.多发性硬化

D.脑血管意外

E.肾与输尿管畸形