计算铁路局的客运密度时,需要掌握铁路局的营业里程和铁路旅客()
A.发送量
B.运送量
C.到达量
D.周转量
参考答案:D
In a recent survey, young people had to imagine _____ they would miss if they lived on a desert island and
90% chose music first. [ ]
A. that
B. how
C. whether
D. what
以下属于肠道病毒引起的疾病是()
A.急性出血性结膜炎
B.无菌性脑膜炎
C.手-足-口病
D.流行性肌痛
E.疱疹性咽峡炎