英语四级改错练习题及答案

　　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．__________

　　Since very few household materials will burn at 65 degrees centigrade．In fact，wood is prepared for construction use by drying in the ovens at 100 degrees centigrade，that is substantially hotter． 10．__________

　　参考答案

　　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