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單項(xiàng)選擇題

After you enter the Ohio River at Cairo，which span of the Illinois Central RR Bridge would you select to pass under? （）

A.Any span is navigable
B.Northbank or Southbank
C.Southbank span only
D.Northbank span only

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單項(xiàng)選擇題

After you enter the Ohio River at Cairo，the Map shows that the deepest water under the Illinois Central RR Bridge would be found under which span? （）

A.Right Descending Bank span
B.Left Descending Bank span
C.Center span
D.Water is equal under all spans

單項(xiàng)選擇題

After the passage of a cold front the visibility（）.

A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor

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