英语四级改错精练(11)

　　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，cockroaches and 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．__________