题目

（9分）如图所示，甲、乙两同学在直跑道上练习4×100m接力，他们在奔跑时有相同的最大速度。乙从静止开始全力奔跑需跑出25m才能达到最大速度，这一过程可以看作匀变速运动。现甲持棒以最大速度向乙奔来，乙在奔跑区伺机全力奔出。若要求乙接棒时奔跑达到最大速度的80％，则：（1）乙在接力区须奔出多少距离?（2）乙应在距离甲多远时起跑?单词拼写.根据下列句子及所缺单词的首字母或汉语意思,写出单词的正确形式.1. A ________ (化学的) change takes place in paper when it burns. 2. We must r________ ourselves of these old ideas.  3. Not having had food for over forty hours, we were all weak from h_________. 4. Because of the heavy rain the l________ of the lake has risen 6 inches. 5. It was a new form of ________ (细菌) and nobody knew how it would affect humans. 6. The cookies are made from g________ and fruit.  7. Farmers consider rabbits to be p________, because they destroy some crops they grow. 8. The violent film is not ________(合适的) for children.9. This food provides the ________(营养) your dog needs. 10. The average ________(产量) of the factory is 20 cars a day.