检查患者腮腺导管口时，较符合慢性阻塞性腮腺炎的体征是

A．清亮唾液

B．无唾液分泌

C．导管口无红肿

D．棕色唾液

E．“雪花样”唾液

Unemployed people always _____ in the streets.           [ ]

A. hang out

B. hang up

C. walk about

D. are hanged