第15题: [单项选择]Mars is not, it seems, the dry old planet we once believed it to be. Astronauts who are (1) to go there in the next decade may find plenty (2) water to slake(消除) their thirst.A. biologists B. geologists C. sociologistsD. psychologists 参考答案:B 答案解析:名同辨析。根据常识,研究火星的应是geologist(地质学家)。biologist意为“生物学家”;sociologist意为“社会学家”;psychologist意为“心理学家”。