Inthedaytimeyouseealargesailingvesselonthebeam

In the daytime, you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows ______.

A.a black ball

B.a black cone

C.two black cones

D.a basket

正确答案：B
在白天你看到一个大的帆船并知道他也用机器推进并且他显示了一个黑色的圆锥