Word came from California of a new weapon in the war on household pests．Two scientists work for a firm in California developed 1．__________ 6 ?: `+ a0 _: A. V6 r# S a new method to eliminate insects with using dangerous chemicals．The new 2．__________" ~6 [4 m* j3 ^- Y1 ~1 H
weapon—hot air．The basic idea is that insect pests can adjust to temperature much above 3．__________ 7 c( _& Q9 n# ~' f0 C normal． In laboratory experiments，cockroaches and termites can’t survive much more than a quarter of hour at 100 degrees 4．__________7 M: d' p5 ?: o
Fahrenheit or about fifty degrees centigrade． The new method involves covering a house with a huge tent，and fill it with air heated to 5．__________ v, U F" b9 p v+ Y
around 65 degrees centigrade．Hot air is forced in with fans and the tent keeps the heat inside the house．Although termites try to escape by 6．__________; L n' ]% S. @( o; G
hiding in wood beams，the heat treatment must be continued by four to six hours．But when it's 7．__________( T. J% X' D+ j; M* a, F, `* ^
all over and the insects are dead， there are no toxic residues to danger humans or pets，and no 8．__________ - z1 k' A- E3 {! \( C7 a1 h funny smells．Scientists claim that there's no danger of fire too． 9．__________ $ g3 e6 |$ ~9 Y% p2 l
发表于 2012-8-14 09:52:33
