大学英语四级改错练习题及答案七

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．2．__________ 
The new weapon—hot air．The basic idea is that 

insect pests can adjust to temperature much above normal．3．__________ 
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 hiding in wood beams，6．__________
the heat treatment must be continued by four to six hours． 7．__________
But when it's 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