单项选择题

以下老年人可避免心脏受压,又利于血液循环的适当睡眠姿势是()卧位。

A.右侧卧位
B.左侧卧位
C.仰卧位
D.俯卧
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单项选择题

Which one is correct about tumor suppressor genes? ()

A.Has the effect of inhibiting cell proliferation
B.Normally expressed in all tumor cells
C.Does not affect cell proliferation and differentiation after deletion
D.Not present in normal human cells
E.Not related to oncogene expression