Don't worry. We still have _____ time.[ ]
A. few
B. a few
C. little
D. a little
答案:D
充分就业允许存在的失业有( )。
A.摩擦失业
B.自然失业
C.自愿失业
D.非自愿失业
呕吐最常见的病因是()
A.消化系统疾病
B.中枢神经系统疾病
C.前庭障碍性疾病
D.感染
E.中毒