The Israeli researchers now hope to develop a bait that is even more desirable to the malaria mosquitoes.

　　Boric acid is generally safe for human beings and other mammals.Professor Schlein says scientists might be able to develop a mosquito bait for enclosed spaces.Boric acid has been used to kill other insects，including cockroaches，termites and ants inside homes since the middle of last century.

　　【语篇解读】 科学家们发现一种新的、对人类无害的、可以杀死疟蚊的方法。

　　5．Which of the following is TRUE about the sweet－smelling substance?

　　A．It is said to be harmless to people but harmful to animals.

　　B．It attracts the mosquitoes but fails to kill them most of the time.

　　C．It is actually created by Professor Schlein.

　　D．It is a mixture of fruit juice oils and boric acid.

　　答案　D　[细节理解题。根据文章第一段可知答案为D。]

　　6．What does the underlined word “it” in Paragraph 2 refer to?

　　A．A sweet­smelling spray.

　　B．The fruit juice oil.

　　C．A sweet­smelling spray with boric acid.

　　D．The sweet boric acid bait.

　　答案　A　[词义指代题。根据文章第二段中The researchers also placed a sweet­smelling spray on the grasses near other ponds.But it contained no boric acid可知答案为A。]

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