GWD2-6

The figure above shows the dimensions of a semicircular cross section of a one-way tunnel.  The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel.  If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A.   5½ ft

B.    7½ ft

C.   8 ½ ft

D.   9½ ft

E.    10 ft

Ｚ这题是怎么回事呢？？我怎么算出来是D  答案是Ｃ　　大家帮帮啊

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