3．请听第5段材料，回答第19至第22小题． 19．What′s the passage about？ A．Losing weight．B．Taking exercise．C．A healthy lifestyle． 20．Why are so many of us unhealthy according to the passage？ A．Because we don′t know how to live a healthy lifestyle． B．Because we don′t know much about life． C．Because we are too busy to care about our health． 21．Exercise can happen any time you have free． A.30 minutes B.15 minutes C.50 minute 22．How many ways to live a healthy lifestyle are there in the passage？ A.2． B.3． C.4．
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