The Secret of Life教案

30﹪ of maize, 50﹪ of soya beans, 50﹪ of potatoes and tomatoes are gm , and 27﹪ of consumers are worried about the dangers of gm.
6. how could gm food be stopped from entering china?
by having the customs inspect all imported foods.
7. how did the writer know that there weren't any imported gm foods in the markets?
they did a big survey.
8. what action is going to be taken about gm foods in china?
foods are going to be labeled.
9. do you think the writer agrees with this action?
yes.
step 4 look at these pairs of sentences from the passage. decide if the second sentence adds to or contrasts with the information in the first sentences.
1. (a) … gm food is already common in the united states.
  (b) china does not produce very much gm food …
2. (a) in canada and the united states, 27 percent of consumers fear that gm food could be dangerous.
   (b) in europe, a majority of consumers are in favor of banning them, and 79 percent of the uk public opposes gm food.
3. (a) chinese customs do not list transgenic products as an item requiring inspection.
   (b) therefore gm products may enter the country from abroad.
4.  (a) neither young nor old people feared possible side effects from gm foods.
    (b) … some parents of children said that they would now pay more attention to food labeling.
step 5 : answer the questions
 1. scientists have found that a crop with agene that kills pests can leave a poison in the soil that kills helpful as well as harmful insects.
(a) what can the crop do?
leave a poison in the soil.
  (b) what does the crop contain?
   a gene that kills pests
  (c) what can the poison in the soil do?
 kills helpful as well as harmful insects
2. yet reducing the amount of insecticides needed by using gm crops can reduce the amount of cancer producing chemicals --- or carcinogens --- that are found in food.
(a) how can you reduce the amount of insecticides needed?
by using gm crops
(b) what needs insecticides?
the crops
(c) what can reduce cancer producing chemicals?
using less insecticides
3. if a gene that produces an allergic reaction is transferred into another crop, then a person who usually avoids food containing this gene may not know that it is now present in the modified food.
(a) what kind of gene is it?
one which causes an allergic reaction
(b) what kind of person is it?
a person who usually avoids those foods
(c) what might this person not know?
that the gm food has that gene in it
4. unfortunately, the “agricultural organisms transgenic engineering safety implementation measures” issued by the chinese ministry of agriculture do not apply to imported agricultural products.