In National Museum of Natural History in Washington, D.C., visitors have a rare chance to enjoy a world filled with hundreds of living butterflies. It’s an e  小题1: exhibition.

It p 小题2:a close look at butterflies. Dan Babbitt,  one of the l 小题3: of the museum says visitors can get very close to the butterflies to learn about their i小题4:   .“Our purpose is to c小题5:  people to the natural world. We have found that using animals and insects is an amazing way to do that.” Babbitt says butterflies are important to the e  小题6: for several reasons.

“One big reason is because of pollination（授粉）. They will t 小题7:   from flower to flower, taking pollen(花粉) from one flower to another. So we won’t have a number of fruit that we like to eat w  小题8: butterflies.”

“We have butterflies from all over the world” he says. “And have already s 小题9:  about 5,000 or so different kinds.” He a  小题10:  that the museum’s goal for the next five years is to let more people learn more about butterflies .

在做《研究匀变速直线运动》的实验时，某同学得到一条用打点计时器打下的纸带如图所示，并在其上取了A、B、C、D、E、F、G等7个计数点，每相邻两个计数点之间还有4个点在图中没有画出，打点计时器接周期为T=0.02s的交流电源．经过测量得：d₁=3.62cm，d₂=8.00cm，d₃=13.20cm，d₄=19.19cm，d₅=25.99cm，d₆=33.61cm。

（1）计算v_F =____________m/s；（结果保留三位有效数字）

（2）物体的加速度a =____________m/s²；（结果保留两位有效数字）