五角形的五个内角的和是（ ）。
180°
In the eyes of a policeman, it's a usually very dangerous to get close to the _____criminal. He may do anything he would to escape.
A．desperate
B．conscious
C．primitive
D．sensitive
抗利尿激素作用的部位是
A．肾小球B．近球小体C．近曲小管D．髓袢升支粗段E．远曲小管和集合管
