题目内容
The report __________ that all children be taught to swim.
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The risk of __________ back problems and twisted or broken ankles is three times higher for a high heel wearer than for a flat shoe wearer.
The source of this interference remains unconfirmed, but increasingly, experts point the blame at __________ computers, radios and cassette players and mobile telephones.
The town is not of any __________ ,but the mountainous area around is important.
The trouble with the global warming __________ is that it has become a moral problem when it's really an engineering one.
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