The result of the teenage diabetic patients shows that
A. those in the control group are more rebellious.
B. text-messaging can motivate them to supervise themselves.
C. conventional treatment isn't as effective as intensive treatment.
D. adult diabetic patients should also try intensive treatment.
须随时向所在地卫生局、药品监督管理局、药品Ar咀监测专业机构报告，并于10个工作日内向卫生部、国家药品监督管理局、国家药品ADR监测专业机构报告E．
依照《国际商事合同通则》的规定，如果一项要约没有规定有效期，但受要约人1理由信赖该项要约是不可撤销的，而且受要约人已依赖该要约行事。则此项要约()。
A. 可以撤回
B. 过了有效期可以撤销
C. 此种要约仍在一定期限内有效
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