填空题

It is much more difficult to ______ than to calculate the benefits of the GM crops.

【参考答案】

define the environmental risks
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填空题
Some European countries are restricting the planting and importation of GM agricultural products because GM crops could pose unique risks to the environment and to health.
填空题
The two factors contributing to the appealing of GM crops to farmer. are ______ and______.
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