Word came from California of a new weapon in the war on household pests.Two scientists work for a firm in California developed 1.__________
a new method to eliminate insects with using dangerous chemicals.The new 2.__________
weapon—hot air.The basic idea is that insect pests can adjust to temperature much above 3.__________
normal.In laboratory experiments， termites can’t survive much more than a quarter of hour at 100 degrees 4.__________
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.__________
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.__________
hiding in wood beams，the heat treatment must be continued by four to six hours.But when it’s 7.__________
all over and the insects are dead， there are no toxic residues to danger humans or pets，and no 8.__________
funny smells.Scientists claim that there’s no danger of fire too. 9.__________
Since very few household materials will burn at 65 degrees centigrade.In fact，wood is prepared for by drying in the ovens at 100 degrees centigrade，that is substantially hotter. 10.__________
答案
1.work→working 2.with→without 3.can adjust→can not adjust 4.hour→an hour 5.fill→filling 6.Although→Since 7.by→for 8.danger→endanger 9.too→either 10.that→which
发表于 2016-7-11 18:38:55