单项选择题
A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.
A.becket
B.loop
C.swivel
D.eye
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A metal object on the pier resembling a tree stump and made to receive mooring lines is a（）.
A.bight
B.bollard
C.chock
D.camel -
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A metal eye spliced into a wire is called a（）.
A.cyclops
B.fish eye
C.thimble
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A ketch is a sailing vessel with（）.
A.one mast
B.two masts: with the mizzen stepped abaft the rudder post
C.two masts: with the mizzen stepped forward of the rudder post
D.two masts: a foremast and a mainmast
