GRE Reading Comprehension: Manhatton-GRE阅读Manhatton - EHFY0PSRA1M2G1T1B$

Bedbug infestations have been a problem in major cities for years. The pesticide DDT has been found to be useful in killing bedbugs. However, DDT was banned in the United States and has been replaced by weaker pesticides. Thus, there is no effective means for eradicating bedbugs in the United States.