The tropical blue moon butterfly has developed a way of fighting back 26 parasitic bacteria. Six years ago, males accounted for 27 1% of the blue moon
population on two islands in the South Pacific. But 28 last year, the butterflies
had evolved a gene to keep the bacteria 29 and male numbers were up to about 40%
of the population. Scientists believe the comeback is 30 “suppressor＂ genes
that control the Wolbachia bacteria that is 31 down from the mother and kills the
male embryos 32 they hatch. “To my 33 , this is the fastest evolutionary
change that has ever been observed, “said Sylvain Charlat, 34 University College
London,UK, whose study 35 in the.
(A) know
(B) appearing
(C) before
(D) pass
(AB) of (AC) passed (AD) just
(BC) due
(BD) by (CD) passing (ABC) knowledge (ABD) appears
(ACD) in check
(BCD) against (ABCD) due to
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