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.

【2017届高考英语牛津译林版必修1总复习限时训练《Unit 2 Growing pains》1-2（江苏专用）】相关文章：

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M11《Unit 4　The next step》Word版含解析

★ 2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单：模块6 Unit 2《What is happiness to you》

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练三

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M4《Unit 1　Advertising》

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：考法1 词法错误（含解析）

★ 2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单：模块6 Unit 1《Laughter is good for you》

★ 2014届高考英语一轮复习课时作业(二十九)必修5Module 5《The Great Sports Personality》（外研版）

★ 2017届高考英语二轮复习课时训练：4（含解析）

★ 2014届高考英语一轮复习课时作业(三十七)选修7Module 1《Basketball》（外研版）

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练十一