题目内容:
According to the passage,the greatest challenge to the new high-speed railway plan is .
A.technical issues
B.safety of the system
C.financial problems
D.maintenance of railway tracks
参考答案:【答案仅供学习,请勿对照自行用药等】
According to the passage,the greatest challenge to the new high-speed railway plan is .
A.technical issues
B.safety of the system
C.financial problems
D.maintenance of railway tracks