假设你是刘梅，请你就本市某些开发商无计划拆除旧建筑，改造城区的现象给市长写一封信，内容应涉及进行城区改造的必要性、没有计划地拆除旧建筑的危害，以及你本人的观点和建议。

A．The author considers that hypochondria is an incurable disease.
B．The author thinks that the consequences of hypochondria might be disastrous.
C．The author suggests that the patients who have hypochondria should set their hearts at rest.
D．The author sympathizes with the patients who suffer from hypochondria.

A．the increasing number of patients
B．the widespread medical knowledge on the Internet
C．the patients' regular visits to doctors that occupy too much time
D．new diseases and symptoms emerge constantly