慢性呼吸衰竭缺氧的典型表现是（）。 A.呼吸频率变慢 B."三凹征" C.发绀 D.

—You seem to be familiar with this city．

—I       here for three years．It's great to be back．

A．have lived

B．lived

C．had lived

D．live

Yesterday when I was playing in Century Park, I came across Mr Li, our physics teacher. The underlined

part means ______. [ ]

A. met

B. happened to meet

C. saw

D. talked with

人民警察的警务保障包括( )。

A．法律保障

B．社会保障

C．物资保障

D．生活保障

属于锥体外系的结构有()

A．胶状质

B．动眼神经核

C．海马

D．纹状体

E．上丘脑