题目

It was in my high school science class. I was doing a task in front of the classroom with my favorite shirt on. A __41 _ came.“Nice shirt，” I smiled from ear to ear. Then another voice said, “That shirt belonged to my dad.Greg's mother works for my family.We were going to __42__ that shirt away, but gave it to her __43__.” I was speechless. I wanted to hide. I __44__ my shirt into the back of the closet and told my mom what had happened. She then dialed her __45__， “I will no longer work for your family，” she told him.That night, Mom told my dad that she couldn't clean如图为“嫦娥三号”登月轨迹示意图．图中M点为环地球运行的近地点，N点为环月球运行的近月点．a为环月球运行的圆轨道，b为环月球运行的椭圆轨道，下列说法中正确的是(　　)A. “嫦娥三号”在环地球轨道上的运行速度大于11.2 km/sB. “嫦娥三号”在M点进入地月转移轨道时应点火加速C. 设“嫦娥三号”在圆轨道a上经过N点时的加速度为a1，在椭圆轨道b上经过N点时的加速度为a2，则a1＞a2D. “嫦娥三号”在圆轨道a上的机械能小于在椭圆轨道b上的机械能