【简答题】The author considers it impossible to obtain no-risk food because ________. A) no food is free from pollution in the environment B) pesticides are widely used in agriculture C) many vegetables contain...
【简答题】It was a very foggy day in London. The fog was so thick that it was impossible to see more than a foot or so. Buses, cars and taxis were not able to run and were standing by the side of the road. Peop...