羚羊角的原动物是()
A.鹅喉羚羊
B.长尾黄羊
C.黄羊
D.赛加羚羊
E.藏羚羊
参考答案:D
磁浮系统主要有两种基本类型,一种是高速磁悬浮系统,另一种是中低速磁悬浮系统。其中高速磁浮线路最小半径不宜小于( )m。
A.250 B.300C.350 D.400
Housing prices in Beijing and Shanghai are now largely ________ for lowincome families.
A.out of control
B.out of touch
C.out of reach
D.out of order