如图所示，在平行金属带电极板MN电场中将电荷量为﹣4×10﹣6C的点电荷从A点移到M板，电场力做负功8×10﹣4 J，把该点电荷从A点移到N板，电场力做正功为4×10﹣4J，N板接地，设地面为零势面．则
—Excuse me, sir, there is _____ tea in your cup, would you like some more? —Yes, please. And give me _____ mooncake. It tasted delicious.
Is this hotel ________ you said we were to stay in your letter?
1a体外长有毛皮，胎生………………………A
1b体外没有毛皮，卵生………………………2
2a体外长有羽毛，体温恒定…………………B
2b体外无羽毛，体温不恒定…………………3
3a表皮干燥，在陆地产卵……………………C
3b表皮湿润，在水中产卵……………………D
