题目

图6是某质点运动的速度图像，由图像得到的正确结果是 A．0~1 s内的平均速度是2m/s B．0~1s内的位移大小是3 m C．0~1s内的加速度大于2~4s内的加速度 D．0~1s内的运动方向与2~4s内的运动方向相反 答案：BC 解析: 本题是对运动图像的考查，考查考生对图像的理解。0～1 s内质点做匀加速直线运动，平均速度，A项错误；图像与坐标轴所围图形面积在数值上等于位移，由此得0～2 s内位移大小为，B项正确；图像斜率在数值上等于质点运动的加速度，故C项正确；0～4 S内质点始终沿正方向运动，D项错误。完形填空 　　In the forest or in the fields you can often see small hills of earth and busy little ants. Ants live in different 1 . An ant has two strong jaws to 2 soil, to cut up food, to 3 the eggs or the young. The head of an ant is triangular(三角形的), with two 4 eyes and sometimes three more very small 5 , which are made up of many parts, 6 the ant can see 7 that moves around it. Some of these eyes see things near it; others can see things 8 in the distance. 　　The ant has six legs. Its feelers have twelve joins (接合点), 9 which the ant finds its 10 in its underground home. Some ants do not 11 nests, but make use of hollows under stones or logs. Other ants build their little hills with 12 , bits of wood, sand and earth. The life of ants is not only 13 and play. They must have rest too. But they don't 14 long. When waking up, they begin to 15 themselves. They use their tongues just 16 a cat uses hers. 　　Ants have a good 17 . When an ant, which has been away for a long time, returns to its nest, the others 18 it and show their greatest joy at its return. But if a strange ant 19 their nest, the ants will 20 the stranger killed at once. 1． [　　] A．hillsB．countries C．placesD．holes 2． [　　] A．waterB．find C．eatD．dig 3． [　　] A．carryB．lay C．turnD．pick up 4． [　　] A．differentB．small C．largeD．tiny 5． [　　] A．eyesB．noses C．mouthsD．feelers 6． [　　] A．yetB．or C．alsoD．so 7． [　　] A．itselfB．everything C．nothingD．something 8． [　　] A．far offB．around C．closeD．clear 9． [　　] A．withoutB．with C．forD．in 10． [　　] A．foodB．bed C．wayD．friend 11． [　　] A．stay inB．find C．buildD．look for 12． [　　] A．trunksB．roots C．branchesD．leaves 13． [　　] A．studyB．work C．searchD．walk 14． [　　] A．grow upB．wander C．stay upD．sleep 15． [　　] A．look afterB．clean C．look aboutD．clear 16． [　　] A．ifB．and C．whileD．as 17． [　　] A．eyesightB．virtue C．memoryD．strength 18． [　　] A．recognizeB．realize C．knowD．see 19． [　　] A．breaksB．enters C．findsD．leaves 20． [　　] A．forceB．make C．haveD．show