單項選擇題

In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.

A.seiche
B.bore
C.boundary wave
D.surge

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單項選擇題

In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n)（）.

A.apogean tide
B.double high water
C.perigean tide
D.bore

單項選擇題

In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.

A.rollers
B.breakers
C.white caps
D.surfers

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