题目内容：
What'sthedifferenceofthetowerduringitsfirstandsecondconstruction? A．Atthefirsttime,itleanednorthwardsbutsouthwardsthesecondtime.
B．Atthefirsttime,itleanedsouthwardsbutnorthwardsthesecondtime.
C．Atthefirsttime,itleanedwestwardsbuteastwardsthesecondtime.
D．Atthefirsttime,itleanedeastwardsbutwestwardsthesecondtime.
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答案解析：