A． two locks for all expensive bike
B． a good lock for an expensive bik
C． cheap locks for cheap bike
D． good locks for cheap bike
参考答案A
解析:细节题。主讲人提到如果买的自行车很昂贵，就需要买两把锁，[A]正确，[B]与此矛盾。这里只提到expensive bike，good lock和cheap ones(便宜的锁)，没有提到cheap bike，[c]和[D]无依据。
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A． How to have the bike stampe
B． How to protect your bik
C． How to buy good lock
D． How to report your lost bike to the polic
单选题
Which course(s) runs or run for one hour each time?
[A] Conversation class.
[B] Writing Skills class.
[C] Examination Skills class.
[D] All of the three courses.
Which course(s) runs or run for one hour each time?
[A] Conversation class.
[B] Writing Skills class.
[C] Examination Skills class.
[D] All of the three courses.
A． Conversation clas
B． Writing Skills clas
C． Examination Skills clas
D． All of the three course