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
查看答案
A．doerB．receiverC．performerD．speaker
A. doer
B. receiver
C. performer
D. speaker
A．happilyB．sadlyC．joyfullyD．fully
A. happily
B. sadly
C. joyfully
D. fully
A．sawB．searchedC．noticedD．found
A. saw
B. searched
C. noticed
D. found
Which of the following might be the best title for the passage？
A. New Railway Standards
Big Railway Dreams
C. High-speed Bullet Trains
D. International Railway Network
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