单选题
1分
Exercise will possibly protect against heart attacks.
参考答案: C
参考解析: 锻炼可能对心脏病有预防效果。usually“通常”，如：His stories usually have a happy ending．他的故事通常有一个美满的结局。roughly“大体上，粗略地”，如：Eight kilometers roughly equals to five miles.8公里约等于5英里。probably“可能地”，如：Van Gogh is probably the best-known painter in the world.梵·高可能是世界上最知名的画家。generally“一般地，广泛地”，如： Generally speaking , people all make mistakes．一般来讲，人人都会犯错。只有probably意思上和possibly最接近。
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