【名词&注释】
国家安全、反对霸权主义、经济关系(economic relations)、共产主义社会(communist society)、卢沟桥事变(the lugouqiao incident)、《个人所得税法》(individual income tax law)、霸权主义、强权政治、独立自主的和平外交政策(independent foreign policy of peace)、国民党五届五中全会、国民党五届三中全会
[单选题]我国独立自主的和平外交政策(independent foreign policy of peace)，应坚持把（ ）
A. 国家主权和国家安全放在首位
B. 反对霸权主义、强权政治放在首位
C. 和平友好，真正不结盟放在首位
D. 扩大开放，发展对外经济关系放在首位
Questions 26 to 30 are based on the following passage. The electromagnet was invented in England by William Sturgeon，who took an iron rod and bent it into the shape of a horseshoe. This “horseshoe” was coated with varnish and a layer of copper wire was wrapped around it. An electric current was passed through the wire，thus making the rod magnetic. The rod was now，because of magnetic attraction，able to support nine pounds of iron. In the US，a scientist named Joseph Henry improved on Sturgeon's electromagnet by insulating the copper wine with silk. He was able to wrap many turns of wire around an iron core without danger of short circuits between the turns. His magnet could hold 2,300 pounds. This experiment prompted Henry to try his hand at converting magnetism into electricity. First he coiled some insulated wire around an iron bar. connecting both ends of the wire to a galvanometer(电流表). The iron bar was placed across the poles of the electromagnet. Then the coil of the electromagnet was connected to a battery. The galvanometer indicated a voltage，then dropped to zero. Henry signaled his assistant to disconnect the coil. The galvanometer showed that once again a voltage had been produced，although this time in the opposite direction. The principle of electromagnetic induction had thus been discovered. Unfortunately for Joseph Henry he did not publish his findings and someone else(Faraday)got the credit for the discovery. The principle of electromagnetic was discovered by______.
B． walking C． driving D． moving
