单项选择题

A．Because she has changed the appointment twice before.
B．Because she is free only at that period of time.
C．Because she has got a toothache all day.
D．Because her dentist will be busy at other periods.
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问答题
例如，虽然他承认远程监控血糖的高低也许会有实际价值，但他指出目前还没有真正独立的研究证实家庭测试这种疾病的价值。
问答题
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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