题目

The parents suggestedin the hotel room but their kids were anxious to camp out during the trip. A . sleep B . to sleep C . sleeping D . slept 答案：C 下列命题正确的是 [　　] A． 若|a|＝0，则a＝0 B． 若|a|＝|b|，则a＝b C． 若|a|＝|b|，则a，b是平行向量 D． 若a与b平行，则a＝b