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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．thereforeB．a(chǎn)nd 　　　　C．then 　　　　D．but
D
連詞辨析。　　A.因此 B.和，并且 C.那么，然后；D.但是。句意：魚能夠產(chǎn)生的電流足夠點(diǎn)亮一盞燈的想法，是令人難以置信的，但是有幾種與確實(shí)能夠做到這一點(diǎn)。故選D。
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