求OG12-59题解释

winny0821

In order to withstand tidal currents,juvenile horseshoe crabs frequently burrow in the sand.Such burrowing discourages barnacles from clining to their shells.When fully grown,however,the crabs can readily withstand tidal currents without burrowing,and thus they acquire substantial populations f barnacles.Surprisingly,in areas where tidal currents are very weak,juvenle hreshoe crabs are found not to have significant barnacle populations,even though they seldom burrow.
which of the following ,if true,most helps to explain the surprising finding?
A.Tidal currents do not themselves disloge barnacles from the shells of horseshoe crabs.
E.Until they are fully grown,horseshoe crabs shed their shells and grow new ones several times a year.
不理解A为什么错，E为什么对。求NN解释

rudder86

非NN~~~~但是当初做这题把ABCDE全排除了还没找到答案~~哈哈~·

全文：没长成熟的horeshoe为了应对tidal currents，就要burrow,但是burrow让他们不长barnacle。一旦他们长成熟了，就可以应对tidal currents，然后barnacle就开始在身上大面积长。然而，在那个浪很weak的地方，这些小horeshoe却被发现没有那么多barnacle，尽管他们不burrow.为神马呢？
A：浪潮不会把barnacles从这些小米咋身上刮走。。。这个没有解释为神马啊，只是排除了一个可能会导致bar不存在的原因，但是没有给出解释。
E：噢~~原来在小horeshoe长大之前他们的shells要更新换代很多次，shells一更新，bar就肯定不会贴在上面了，所以这些人观察到这些小米咋的时间刚刚好遇上了他们换壳。

winny0821

顿时醒悟~谢谢啊