影响正常人舒张压的主要因素是

A．心输出量
B．小动脉口径
C．大动脉弹性
D．血液粘滞性
E．血流速度

Earth Day is a celebration of life and our planet. It is a reminder that we need to ______ the world we live

in and that we should learn to respect life and nature. [ ]

A. care about

B. think over

C. take possession of

D. refer to