D) is the same as it was 50 million years ago

　　注：B 选项体现一段结尾和二段开头，应该优选，含有关系词 because,although,not only...but also, as well as 的应该优选

　　To appreciate the precision of the bats echo location, we must first consider the degree of their reliance upon it. Thanks to sonar, an insect-eating bat can get along perfectly well without eyesight. This was brilliantly demonstrated by the Italian naturalist Lazzaro Spallanzani. He caught some bats in a bell tower, blinded them and released them outdoors. Four of these blind bats were recaptured after they had found their ways back to the bell tower, and on examining their stomachs contents, Spallanxani found that they had been able to capture and eat flying insects. We know from experiments that bats easily find insects in the dark of night, even when the insects make no sound that can be heard by human ears. A bat will catch hundreds of softbodied silent flying insects in a single hour. It will even detect and chase pebbles tossed this is the age of technological triumphs

　　B) modern machines are inefficient

　　C) living mechanisms are often more efficient than man -made machines

　　D) artificial imitations are always less efficient than living mechanisms

　　注：1.第一段 illustration 等同 example

　　2.D选项的always与文章中的often含义是不同的。

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