题目

正确的实验操作是进行科学实验的重要保障．下列操作中，合理的是（） A . 少量酒精在实验台上燃烧时，立即用湿抹布盖灭 B . 稀释浓硫酸时，将水注入盛有浓硫酸的烧杯中 C . 测定某溶液的pH时，先用水将pH试纸润湿 D . 向试管中滴加液体时，将胶头滴管伸入试管内，防止液体溅出 答案：AA very little boy was spending his Saturday morning playing in his sandbox. He had with him a plastic pail (桶) and a shiny, red plastic shovel (铲). In the 　1 of creating roads and tunnels in the sand, he 　2 a large rock in the middle of the sandbox. The boy dug around the rock, 　3 to move it off the dirt. At first, he wanted to carry it out of the sandbox with his hands; however, it was too heavy. Later, with much 　4 , he pushed the rock across the sandbox by 　5 his hands. When the boy got the rock to the 　6 of the sandbox, he found that he couldn’t roll it up and 　7 the little wall. 　8 , the little boy pushed, but every time he thought he had made some 　9 , the rock tipped (翻滚) and then fell back into the sandbox. The little boy pushed and pushed, but his only 　10 was to have the rock roll back. Finally he 　11 tears. All this time the boy’s father watched from his living room window 　12 the drama was unfolded. The moment the tears fell, a large 　13 appeared across the sandbox. It was the boy’s father. Gently but 　14 , he said, “Son, why didn’t you use all the strength that you had?” Defeated, the boy 　15 back, “I did! I did! I used all the strength that I had!” “No, you didn’t. You didn’t ask me for help.” The father 　16 down, picked up the rock and dropped it off the sandbox. Do you have “rocks” in your life that need to be 　17 ? Are you discovering that you don’t have 　18 it takes to lift them? There is someone who is willing to give us the 　19 we need. Maybe, it’s sometimes a good idea to ask others for 　20 when we meet difficulties we can’t overcome. 1. A. method　　　　　　 B. step　　　　　 C. practice　　　　 D. process 2. A. created　　　　　 B. set　　　 C. discovered　　　 D. brought 3. A. trying　　　　　　 B. managing　　　 C. deciding　　　　 D. competing 4. A. thought　　　　　 B. struggle　　　 C. movement　　　　 D. worry 5. A. touching　　　　　 B. shaking　 C. using　　　　　　 D. controlling 6. A. bottom　　　　　　 B. center　　　　 C. edge　　　　　　 D. front 7. A. over　　　　　 B. down　　　　　 C. through　　　 D. into 8. A. Doubted　　　 B. Surprised　　 C. Pleased　　　 D. Determined 9. A. attempt　　　　　 B. progress　　　 C. effort　　　　　 D. decision 10. A. hope　　　　　　 B. reward　　　　 C. point　　　　　　 D. purpose 11. A. made out　　　　 B. broke out　　 C. burst into　　　 D. rushed into 12. A. so　　　　　　　 B. as 　　　 C. until　　　　　　 D. before 13. A. rock　　　　　　 B. picture　　　 C. figure　　　　　 D. shade 14. A. surprisingly　　　　 B. doubtfully　　 C. kindly　　　　　 D. firmly 15. A. shouted　　　　　　 B. smiled　　　　 C. called　　　　　 D. asked 16. A. reached　　　　　　 B. looked　　　　 C. fell　　　　　　 D. put 17. A. pushed　　　　　 B. dropped　 C. carried　　　　　 D. removed 18. A. who　　　　　 B. what　　　　　 C. which　　　　　　 D. where 19. A. minds　　　　　　 B. spirits　　　 C. force　　　　　　 D. strength 20. A. help　　　　　　 B. tips　　　　　 C. advice　　　　　 D. ideas