填空题

The two factors contributing to the appealing of GM crops to farmer. are and.

【参考答案】

operation simplification，yields increase

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填空题

To certain extent, GM crops are regarded as ______since the gene inserted into a plant cannot be seen, tasted or touched.

填空题

Study done in Swiss and Cornell University indicated that Bt crops could’ have unreasonable adverse effects on insects in the field.

The two factors contributing to the appealing of GM crops to farmer. are ______ and______.