问题
选择题
Tom never loses heart in face of difficulties,__ ,he always tries his best to overcome them.
A．On the other hand
B．On the contrary
C．At the same time
D．As a result
答案
答案：B
短语辨析。A另一方面；B恰恰相反；C同时；D结果是。句意：面对困难时，Tom从未丧失信心。恰恰相反，他总是努力克服 。故B正确。