51. How did the author respond to the Captcha test?
- A. He clicked on the cells randomly.
- B. He accepted the challenge readily.
- C. He completed it confidently.
- D. He worked on it submissively.
答案：D
答案句：I was presented with an image of a roadside scene over which was laid a grid. My “challenge” was to click on each cell in the grid that contained a traffic sign. I did so, a bit irritated. Then I was presented with another image and another grid-also with a request to identify road signs. Like a lamb, I complied, after which the website accepted my input.
参考译文：我面前出现了一幅路边场景的图像，上面覆盖着一个网格。我的“挑战”是点击网格中包含交通标志的每个单元格。我照做了，有点恼火。然后我又看到另一幅图像和另一个网格——同样要求识别路标。我像羔羊一样顺从地照办了，之后网站接受了我的输入。
定位线索：题干“How did the author respond to the Captcha test?”→答案句取自第1段“I did so, a bit irritated”和“Like a lamb, I complied”；文中“Like a lamb”对应选项D“submissively”（顺从地）。
解析：题干问作者对验证码测试的反应。答案句中“Like a lamb, I complied”（像羔羊一样顺从地照办）直接对应D选项“submissively”（顺从地）。A项“randomly”（随机地）无中生有，文中明确说点击包含交通标志的单元格；B项“readily”（欣然）与文中“a bit irritated”（有点恼火）矛盾；C项“confidently”（自信地）文中未提及。因此D正确。