假设在宇宙中发现一颗有与地球人类一样生命形态的行星，则该行星可能没有（ ）
A．大气层
B．液态水
C．像太阳一样的恒星照射
D．像月球一样的卫星绕行
答案：D
题目分析：借鉴地球生命存在的基本条件，生命存在的条件应包括：适宜的温度、液态水、较厚的大气层和稳定的光照等，故D项可能没有。
点评：本题难度一般，学生只要掌握地球生命存在的基本条件，并学会知识的迁移应用即可。
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| "Two books per visit per week, "said the unsmiling librarian as she handed a library card.Neither the limits nor her attitude __1__ me, a 9yearold Jewish girl growing up in Berlin in the 1950s.I needed those visits.The books were filled with stories in which, however __2__ things seemed, everything __3__ well in the end, __4__ justice, bravery, and wisdom-a striking contrast to my everyday experiences. Thirty years later, I, a recent immigrant to the US with a daughter aged 13, stood in front of another librarian.This librarian was __5__. "What did she say?"I asked my daughter, who already knew a little English and often __6__ as my interpreter. "She said 'Can I help you?'" "Ask if they have any books in German, "I requested. "No, they don't."translated my daughter. While hunting for a job, I was told that the library needed people to __7__ books.The interview was short-the job didn't require much English, just a __8__ of the alphabet.I started the next day.Every day, I handled hundreds of books whose meaning was __9__ from me, mentally dividing them by size and color. One day, while shelving, I found English for Beginners and began studying it on my own.Step by step English letters started forming words I could __10__, words combined into phrases, and-oh, __11__!-I was reading.It was a slow process, supported by dictionaries and __12__ by tears, but it was progress. Afterwards I got promoted to the front desk-__13__ books in and out and answering simple questions. Every day I receive dozens of people.Sometimes I spot new immigrants.They come from all over the world, so they look different, but the hesitant expression on their faces and their __14__ manners are similar.My heart goes out to them, for they are people like me.I fully understand the __15__ roads on which they have stepped."They've come to the right place, "I think to myself.Then I smile and say-just the way a librarian said to me a long time ago-"Can I help you?" | ||||
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