17. It is implied in the passage that... A) the pollution caused by herbicides and pesticides easily be overcome.
B) we damage environment in various ways in our efforts to grow crops for food.
C) it is possible to grow plenty of food without using any fertilizers
D) aquatic plants and animals are the ones that differ most from the use of chemicals.
18. What is the very initial stop in producing food? A) protecting crops against weeds and pests
B) Hearing land and planting crops
C) damaging land in various ways
D) delivering fruits and vegetables to supermarkets