Apparently, advanced tortoises evolved multiple times: the high-domed shells and columnar, elephantine feet of current forms are

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问题 Apparently, advanced tortoises evolved multiple times: the high-domed shells and columnar, elephantine feet of current forms are specializations for terrestrial life that evolved________on each continent.

选项 A、independently
B、interchangeably
C、paradoxically
D、simultaneously
E、symmetrically

答案A

解析逻辑连接标志为冒号，前后同义对应。前面说advanced tortoises(现代龟)演化了不止一次，因此后面要跟前面同义对应，空格里填入的词要能够体现出现代龟演化了多次，这里的independent可以体现演化了多次，因为如果好几个特征只演化了一次，这些特征之间显然是dependent的，如果几个特征是independently演化的，那就一定是经过多次演化出来的。因此，选A项independently(独立地)。从后面的修饰成分也能判断出选independently，后面说了这些性状是在每一个大陆上进化出来的，既然是在不同大陆上进化的，显然应该是独立进化的，因此选A。

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