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【简答题】
某校学生会准备调查七年级学生参加“武术类”、“书画类”、“棋牌类”、“器乐类”四类校本课程的人数． (1)确定调查，甲同学说：“我到七年级(1)调查全体同学”；说：“放学时我到校门口随机调查部分同学”；丙同学说：“我到七年级每个班随机调查一定数量的同学”．请指出哪位同学的调查方式最合理． (2)他们采用了最为合理的调查方法收集数据，并绘制了如图所示的统计表和扇形统计图． 请你根据以上图表提供的信息解答下列问题： ① a ＝ ， b ＝ ； ②在扇形统计图中，器乐类所对应扇形的圆心角的度数是 ； ③若该校七年级有学生560人，请你估计大约有多少学生参加武术类校本课程．
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of, with.
B.
with, towards.
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about, about.
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They talked about their lives.
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