The idea of fish being able to produce electricity strong enough to light a lamp is almost

The idea of fish being able to produce electricity strong enough to light a lamp is almost unbelievable, several kinds of fish are really able to do this.
A. therefore
B. and 　　　　
C. then 　　　　
D. but

A. thereforeB. and 　　　　C. then 　　　　(答案→)D. but解析：连词辨析。　　A.因此 B.和，并且 C.那么，然后；D.但是。句意：鱼能够产生的电流足够点亮一盏灯的想法，是令人难以置信的，但是有几种与确实能够做到这一点。故选D。

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