A:西藏
B:新疆
C:宁夏
D:广西
①不经过努力,学习能取得好成绩吗?
②这道题有你说的那么难吗?
③恐龙的灭绝,难道不是一个谜吗?
Most of the representatives attending the conference are not________the project, for it costs too much.