问题
不定项选择
关于力和运动的叙述，下列说法中正确的是[ ]
A．物体受到力的作用，运动状态一定会改变
B．物体的运动状态在改变，此时物体一定受到力的作用
C．物体的运动状态不改变，物体一定不受力的作用
D．物体不受外力的作用，物体一定处于静止状态
答案
答案：B
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关于力和运动的叙述，下列说法中正确的是[ ]
A．物体受到力的作用，运动状态一定会改变
B．物体的运动状态在改变，此时物体一定受到力的作用
C．物体的运动状态不改变，物体一定不受力的作用
D．物体不受外力的作用，物体一定处于静止状态
答案：B
Ten-year-old Johnny was one of the laziest boys in his class. His homework was always and it was usually wrong. He only did half the number of math problems the other children did and in his compositions he _____ half the number of words. And usually the words were _ spelled because he was too lazy to use a One day his class went on a bus trip. The____ did not want to take Johnny with them. But there was no one to look after Johnny at the school so she had to take ."Now, children," the teacher said, "On our bus trip we will____ old buildings, some beautiful countryside, and many other things. I want you to write about _____ interesting you see on the trip. "The bus trip . The children looked out of the windows at all the interesting things. They took notes _____ their notebooks. The teacher was very____ with them. Then she saw Johnny on the floor of the bus and went up to him. "Are you ?" she asked him. "No." he said. "Then are you lying on the floor?" "If I can't see anything," he said, "I can't write about it, can I?"
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