能不能帮我把题干解释一下！！！！谢谢！！！！我不理解！！！

小黛安

In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe 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 dislodge barnacles from the shells of horseshoe crabs.
B.    Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
C.    The strength of the tidal currents in a given location varies widely over the course of a day.
D.    A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
E.    Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

houhaibo528

为了抵御潮汐，小马掌蟹经常在沙中造穴。 这种行为使b不能附着在马掌蟹的壳上。然而，当小马掌蟹发育完全后，它们不用造穴也能轻而易举的抵御潮汐，因此它们可以获得相当数量的b.令人吃惊的是，在潮汐非常弱的地域，小马掌蟹被发现并没有附着大量的b,即使它们从不造穴。
下面哪个选项如果正确的话，最能辅助解释这种惊人的发现
A.不是潮汐本身使b从马掌蟹贝壳上脱落
B.在潮汐最弱的地域，b最容易附着于马掌蟹
C.在一个特定的位置，潮汐的力度会随一天内时间的推移而大幅变化
D.大量的b而已有效的削弱马掌蟹觅食的能力
E.在完全发育之前，马掌蟹一年内多次蜕壳并重新长壳

In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe 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 dislodge barnacles from the shells of horseshoe crabs.
B.    Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
C.    The strength of the tidal currents in a given location varies widely over the course of a day.
D.    A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
E.    Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

-- by 会员 小黛安 (2011/9/14 6:31:32)