B

　　Israeli researchers say they have developed a substance that attracts and kills the mosquitoes infected with the malaria parasite(疟原虫)．However，the sweet－smelling substance is said to be harmless to people and animals，Scientists at Hebrew University in Jerusalem developed the sugary bait by combining fruit juice oils and boric acid(硼酸)．The fruit juice oils get the attention of the mosquitoes，and the boric acid kills the insects when they eat it.

　　The scientists took the sweet boric acid bait to the West African nation of Mali.They sprayed(喷洒) it on the plants near the man－made ponds which are home to “Anopheles Gambiae”，the mosquitoes that carry the most deadly form of malaria(疟疾)．The researchers also placed a sweet－smelling spray on the grasses near other ponds.But it contained no boric acid.Both of the substances also contained a substance that would mark any mosquito that came in contact with the bait.In this way the scientists could count the mosquitoes that fed on it.

　　Yosef Schlein，an expert on the insects that affect human health，led the sweet bait research.He says thirty－eight days of results show the sweet boric acid bait proved very effective in killing mosquitoes.At the ponds treated only with sweet－smelling bait，Professor Schlein says，more than seventy－five percent of mosquitoes fed on the false bait.He says most people do not know that female mosquitoes feed on sweet plant nectar to survive.

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