填空题

What is the passage mainly concerned

【参考答案】

The effect of mass transportation on urban expansion.
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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.
单项选择题
A．Eggs.B．Diets.C．Protein.D．Exercises.
A．Eggs.
B．Diets.
C．Protein.
D．Exercises.
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