_PP题库网

填空题

A lot of people think we could be headed for trouble by tampering with Mother Nature and producing genetically altered food. But those who (1) say it’s no more unnatural than traditional selective breeding, to say nothing about (2) and chemical pesticides.
Most Canadians regularly eat bio-engineered food. Anyone who consumes cheese, potatoes, tomatoes, (3) is taking in genetically modified (GM) food. In addition, (4) contain GM ingredients. In fact, around 65% of the food we get from the shops has some genetically modified component. GM food does not (5) in Canada, so most of us don’t know we are eating it. Some of the items that have (6) GM material might surprise you. They include chocolate bars, baby food, margarine, (7) , ice cream, (8) , cereals, and cookies.
(9) have used GM foods for centuries; if they hadn’t, we’d probably still be (10) . They’ve refined the foods we eat through selective crossbreeding, combining different types of wheat, and (11) . Today, however, genetic engineering is no longer just a case of mixing different varieties of (12) . Now, genes from completely different life forms are being combined—fish genes into tomatoes to (13) , for example.
Such "tampering with Nature" makes a lot of people anxious. They wonder if the foods that come out of genetic modification are (14) . Scientists say they are completely safe; GM is just a way of (15) to make it possible for them to survive without the use of pesticides and to (16) . But the (17) that scientists said that nuclear power and the toxic insecticide DDT were also completely harmless.
Supporters of GM foods (18) . They say producing GM food is a move in the right direction, that it will (19) , the environment, and the economy. They are convinced it will solve the world’s hunger problems, lead to a drop in pesticide and herbicide use, and result in (20) .

【参考答案】

promote genetically modified foods