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【参考答案】

因为此项技术仍处于初期，医学专家对它的价值，意见存在分歧，因而有必要进行这类研究。
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问答题
雅虎开始为用户提供了解他们慢性胸腔疾病情况的在线绘图服务，用户使用的是一个和掌上电脑差不多大小的呼吸监视器，它可以实时测量他们的肺部功能，并且直接将数据通过电子邮件发送给医生。
单项选择题
A．A period when cars are rushing on the roads.B．A period when people are going to or from their work.C．A period when cars are crowed on the roads.D．A period when people are crowed in the buses.
A．A period when cars are rushing on the roads.
B．A period when people are going to or from their work.
C．A period when cars are crowed on the roads.
D．A period when people are crowed in the buses.
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