在“探究物质的密度”的实验中，图1所示是我们实验用的天平，砝码盒中配备的砝码有100g、50g、20g、10g、5g等．

    It was a playground. Eight ____(child) were standing on the starting line to take part in a running race.

    Ready? Bang!

    All eight girls started running ____ they heard the sound. After a minute, one of the small girls fell down. Because ____the pain(痛), she started to cry. When the other seven girls heard, they stopped running ____(quick).Then they stood for a while to see what happened. They decided ____(run) back to the place where the girl fell down. One of them kissed the girl and told ____ to be strong. They said, “We will be together ____ you.” Then, seven girls helped the fallen girl stand up and looked after her carefully. The eight girls joined hands together, walked together and ____(get) to the winning line. People were moved. Clapping(掌声) of ____(hundred) of people came out. Though they lost the race, they were all ____best runners!

    All these special girls are strong and brave. What did they teach this world？Teamwork! Friendship! Love!：

某人向一个半径为6的圆形标靶射击，假设他每次射击必定会中靶，且射中靶内各点是随机的，则此人射击中靶点与靶心的距离小于2的概率为（　　）

2016年3月17日，新华社授权播发的“十三五”规划纲要中指出：“增强国有经济活力、控制力、影响力、抗风险能力。”国家之所以重视国有经济，因为国有经济（    ）

①用一个完好的小灯替换R₂后，小灯____ （选填“一定发光”、“一定不发光”或“可能发光”）．

②电路中可能存在的故障是____．（请选填相应故障前的字母．A：R₁断路；B：R₁短路；C：R₂断路；D：R₂短路；E：R₁、R₂都断路；F：R₁、R₂都短路；G：R₁断路同时R₂短路；H：R₁短路同时R₂断路．）