问题补充：
Tom skating, so he spends all his spare time on it.
A. is popular with
B. is concerned about
C. is proud of
D. is crazy about
答案：
A. is popular with
B. is concerned about
C. is proud of
(答案→)D. is crazy about
解析：词义辨析。A受…欢迎；B担心…；C为…骄傲；D对…迷恋；句意：Tom迷恋滑冰，所以他把所有的时间业余时间都放在上面。根据句意说明D正确。
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