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指南针、印刷术、火药武器三项重大发明创造是宋代科技最突出的成果。指南针的改进给航海业带来划时代影响，宋代中国商船在波斯湾一带都极为活跃。阿拉伯人不久就从中国人这里学会使用指南针指导航向，并将这一技术传到欧洲。在唐代雕版印刷术的基础上，北宋平民毕昇发明了活字印刷术，这一发明大大节省了人力，缩短了出书周期，这是印刷史上又一次重要的技术革命。活字印刷术大约14世纪传到朝鲜和日本，15世 纪传到欧洲。印刷术在欧洲的出现从根本上改变了欧洲的社会文化环境，对当时欧洲资产阶级的兴起和思想文化的传播，起到了巨大的推动作用。

——摘自张岱年《中国文化概论》

阅读下面短文，从各题所给的A、B、C、D四个选项中选出最佳选项。
C
    It was Sunday. Henry did some shopping and then went to the car park. It was about to start the car when a robber stood up from the back seal. He held a knife to Henry's bead. "Give mc your wallet and drive me to North Street!" he shouted.
    "All right," Henry answered. Then he started the car and drove away. Being 72 years old, be knew he could not fight the young robber. He knew he needed help. Where were the police? As he drove towards each crossing, he looked up and down the side streets, hoping to meet a police car. But he could see none. "Just my luck," he thought. "If I was driving too fast, there would be a police car on every corner."
    So he pushed his foot down on the accelerator (油门), and the car ran much faster. "What are you doing?" shouted the robber. "Keeping off the police," Henry answered. "I thought I saw a police car back there."
    He ran red lights, drove the wrong way on one-way streets. On two way streets he drove on the wrong side of the road. Not one policeman saw him. Again Henry's plan was not working. He had to try a new plan.
    He turned a corner and saw the police station in front. Then he drove his car as fast as he could towards the police gate. The car hit a police motorbike down and stopped. Henry shouted, "Help! Help!" Then he turned back to grab the man's knife. At the same time the policemen heard the shout and quickly caught the robber.

现有一长5米的梯子，架靠在建筑物上，它的底部在地面的水平距离是3米，若梯子沿建筑物竖直下滑1米，则梯子底部滑动的距离是____ m．

—Dr. Jackson is not in his office at the moment.

—All right. I____ him later.

阅读图文材料，卤虫生存于高盐海域，以藻类为食，是水产养殖的优质活体饵料，也是候鸟的食物来源，美国大盐湖（图）属内陆沿湖，卤虫资源丰富，20世纪50~70年代，大盐湖卤虫产业规模小，产品需低温运输，主要用于喂养观赏鱼类，80年代以来，随着水产养殖业快速发展，大盐湖卤虫产业规模不断扩大。