Set2-L3
1. What do the speakers mainly discuss?
A. The advantages of using natural predators to control pests
B. The kinds of damage that aphids can cause to soybean crops
C. Recent research that revealed disadvantages of an organic pesticide
D. Environmentally responsible alternatives to traditional synthetic pesticide
2. Why does the man mentioned lemonade?
A. To question whether natural chemicals are always the safest option
B. To illustrate a common preference for natural substances over synthetic ones
C. To point out that synthetic chemicals are sometimes similar to natural ones
D. To suggest that natural chemicals should not necessarily be considered organic
3. In the study described by the professor, how did the organic pesticide work?
A. By preventing the aphids from breathing
B. By making soybeans toxic to the aphids
C. By exposing the aphids to toxic chemicals in the soil
D. By increasing the population of the aphids’ natural predators
4. What did the researchers find out about the organic pesticide they tested? Click on 2 answers
A. It had to be applied in large quantities
B. It failed to control the aphid population
C. It was toxic to organisms that were not harmful to the crops
D. It damaged the soybean crops where it was used
5. What does the professor imply about flower bugs?
A. They have recently been introduced to North America
B. They may pose a new threat to soybean crops
C. They lower the aphid population more than both synthetic and organic pesticides
D. They are not seriously affected by the synthetic pesticide used in the study
6. What does the professor imply when she discusses government regulations?
A. She is disappointed that many regulations support the development of pesticides
B. She is concerned that some regulations may be based on unjustified
C. She hopes that more regulations will require the use of organic pesticides
D. She is confident that most regulations are enacted after extensive research
