第8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. detected B. touched C. seen D. felt 参考答案:A 答案解析:动词辨析。空格所在的分句是被动语态,意为:在火星上,软着陆的仪器没有______令人信服的生命存在的迹象,故选detect(发现,察觉)。