개인적인 예열 지문 pick (230638)

Simply maintaining yields at current levels often requires

new cultivars and management methods, since pests and

diseases continue to evolve, and aspects of the chemical,

physical, and social environment can change over several

decades. ( ① ) In the 1960s, many people considered

pesticides to be mainly beneficial to mankind. ( ② )

Developing new, broadly effective, and persistent

pesticides often was considered to be the best way to

control pests on crop plants. ( ③ ) Since that time, it has

become apparent that broadly effective pesticides can

have harmful effects on beneficial insects, which can

negate their effects in controlling pests, and that

persistent pesticides can damage non-target organisms

in the ecosystem, such as birds and people. ( ④ )

Also, it has become difficult for companies to develop

new pesticides, even those that can have major

beneficial effects and few negative effects.

Very high costs are involved in following all of the

procedures needed to gain government approval for

new pesticides. ( ⑤ )

Consequently, more consideration is being given to

other ways to manage pests, such as incorporating

greater resistance to pests into cultivars by

breeding and using other biological control methods.

* pesticide: 살충제  ** cultivar: 품종  *** breed: 개량하다

출처: 2023학년도 6월 모평 영어 38번 문항