22. The glass tube in a fluorescent lampcontains mercury vapor under small pressure. A B C D 26. Won its war for independence in 1783, the United States then struggled to establish A B its own economic and financial system. C D 35. Because of its maneuverability and ability to land and take off in small areas the A B C helicopter is used in wide range of services. D 38. Anthropologist Jane Goodall has contributed a wealth information concerning primate A B behavior through her studies of chimpanzees. C D
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2005-4-21 00:07:00
