单项选择题

对水稻田的害虫，应采取以选用抗虫品种为主，加强栽培管理，合理使用农药为辅，保护自然天敌的(　　)措施。 A.
植物检疫 B.
农业防治 C.
物理机械防治
D.
综合防治

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单项选择题

Which of the following sentences is the most objective?

A．Our analysis and findings of the experiment make me puzzled.
B．The analysis and findings of our experiment show that the technique is too puzzling.
C．We analyzed the experiment and what we found made us realize that the technique is quite complex.
D．The analysis and findings of the experiment reveal that the technique is quite complex.

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某建设项目经计算确定D10%为2km，则该项目的大气环境评价范围为以排放源为中心点，以（）。
A 2km为半径的圆
B 2.5km为半径的圆
C 周长10km矩形区域
D 边长2km矩形区域