We can dress the seeds with pesticides before sowing.

2. What do you know about chemical pesticides?

We can dress the seeds with pesticides before sowing. A: 正确 B: 错误

Pesticides must be burned at very high temperature because high temperatures can limit ______.

Effects of long term use of pesticides include ( ) A: imbalances in ecosystems B: develop new dominant pest species C: lose keystone species. D: Beneficial organisms and even natural enemies of the pests may be among the species eliminated by pesticides

The major problem is the need for large quantities of water and ______ to grow the crops. A: food B: fertilizers C: pesticides D: chemicals

For the study, two types of rice were genetically altered to resist two common insect ___________, which usually require heavy use of pesticides to control. A: pests B: traits C: conventional D: skeptics

Which of the following would increase the supply of corn? A: a decrease in the price of wheat B: an increase in the price of pesticides C: a severe drought in the corn belt D: a decrease in the demand for corn E: a fall in the price of corn

The main purpose of the first 3 paragraphs of the passage is to ______. A: prove that contaminants are harmful to health B: show that contaminants could affect the future generations C: describe some experiments made by toxicologists D: urge that pesticides should be abandoned

The author considers it impossible to obtain no-risk food because （） A: many vegetables contain deadly natural chemicals B: almost all foods have additives C: no food is free from pollution in the environment D: pesticides are widely used in agriculture