收/发筒不可指向站内的构筑物或其它装备，也不应正对间距小于或等于（）m的居住区或建（构）筑物
A.40
B.50
C.60
D.70
参考答案：C
—Excuse me, are these ______ new shoes?
—No, they aren’t. ______ are black over there.
A．your; Mine
B．my; Your
C．her; Her
D．mine; Yours
