It is amazing that the little boy can swim the river 100 meters in width. A. across; measu

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(答案→)A. across; measuring
B. over; measured
C. across; measure
D. through; measuring
解析：考察介词辨析和measure用法。Across指从表面越过（有接触面）；over从空中越过（无接触面）；through从内部穿过；动词measure指长度为…；重量为…；该词没有被动语态的形式。句意：这个小男孩能够游过这条宽度为100米的河，真是让人惊讶啊！本句是指从河流的表面越过，故使用across。Measuring 100 meters是现在分词短语在句中作定语。故A正确。