标题: 跪求解释 [打印本页] 作者: harvard2012 时间: 2011-6-19 09:38 标题: 跪求解释 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. 无关，这是个假设前提，不构成解释
B. Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest. 走极端weakest，而且增加了矛盾
C. The strength of the tidal currents in a given location varies widely over the course of a day. 无关，一天内海潮强度变化是自然规律
D. A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food. 无关，哪跟哪啊
E. Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.小C一年脱换好几次壳直到它们完全长大成鳖 作者: colasama 时间: 2011-6-19 12:24
年轻的螃蟹喜欢burrow，以防被水冲走。burrow这个动作会使Barnacles很难粘在小蟹的壳上。 等蟹长大了，不burrow了，壳上就会有很多Barnacles。