题目

III. 完型填空 （共20小题，每小题1.5分，满分30分） A 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   36   of creating roads and tunnels in the sand, he   37   a large rock in the middle of the sandbox. The boy dug around the rock,   38   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   39  , he pushed the rock across the sandbox by   40   his hands. When the boy g日常生活中的一些小窍门或小常识往往包含着一些化学原理．下列做法正确的是：①油锅着火时迅速加入大量青菜灭火：②甩钢丝球擦洗铝锅上的污垢：③用热的纯碱水洗涤铁锅上的油污：④煤气泄漏及时打开换气扇排气（ ）A．①②B．①③C．②③D．②④