One of the methods of introducing foreign genes into a plant is to make use of certain
soil bacteria to infect the plant and transfer several of blue genes to the infected plant
cells, _____ in high rate of plant cell pision.

—The rabbit can see behind itself without _______ its head.

—Really? That's interesting!

若a=﹣0.2²，b=﹣2^﹣2，c=（﹣ $\frac{1}{2}$ ）^﹣2，d=（﹣ $\frac{1}{2}$ ）⁰，则它们的大小关系是（   ）

读日本相关图文资料，完成下列问题。

在一个由水稻、蝗虫和青蛙组成的相对封闭的生态系统中，若青蛙被大量捕杀，能表示蝗虫数量变化的曲线图是（  ）