MK二号是一颗几十亿公里外的行星，它在许多宗教里都是生命起源的地方。物理学家已经证明了它温和的气候和重力的牵引都和地球相似的理论；天文学家也通过卫星，在它的大气层里发现了氧原子和二氧化碳的存在，这些都是对生命来说，都是基本的。受到这一消息的鼓舞，生物学家们接着开始了研究以解开人们的迷惑——既然有了适合的条件，生命真的存在于这个星球吗？他们是通过下蛋，还是产仔来繁殖后代的呢？
上个月，一艘太空飞船被派到了那儿。可惜的是，这次任务失败了。不像地球，MK二号是一颗年轻得多的行星。因此，大团大团的有害酸云到处漂浮，引起猛烈的连锁反应的爆发。这些云团不仅阻挡了飞行员的视线，而且还损坏了发动机系统。幸运的是，飞行员小心注意，才及时阻止了飞船的坠毁。
15.A Journey across Canada
横穿加拿大的旅行
After a quiz last autumn, Kuang crossed the continent eastward to Toronto to visit his schoolmate, the distance measuring approximately 5,000 kilometers,
His train started from Vancouver, a city surrounded by mountains. After confirming his baggage was aboard the train, Kuang settled down in his seat. Having a gift for communication, he started chatting with another passenger within 5 minutes. Their topics included the Canadian traditions, the Prime Minister, the mixture of races, and the terrifying Great Fall. After a nice buffet at noon, he was pleased to find that the scenery was impressive. He saw beautiful harbours in the distance, wealthy urban areas and maple forest that covered thousands of acres. He even managed to catch sight of an eagle flying upward over bushes.
Kuang reached Toronto which lies slightly near the border at a misty dawn. There was frost and the broad downtown streets were very quiet. Though it was early, Kuang phoned his schoolmate in a booth nearby at once rather than waiting for him to come. They had a good time together.
去年秋天的一次考试后，光向东横穿整个大陆，来到多伦多探望他的同学，这次旅行的距离测量起来大约有五千多公里。
他的火车从群山围绕的温哥华启程。在证实了自己的行李都在火车上之后，光就在座位上安坐下来。因为在与人交流方面有天赋，他在5分钟内就和另一个乘客聊起天来。他们的话题包括加拿大的传统、加拿大的总理、种族的混合，还有让人心惊胆战的大瀑布。中午吃了一顿美味的自助餐后，他很高兴发现外面的风景非常让人印象深刻。他看见了远处美丽的海港、富裕的市区，还有延绵几千亩的枫树林，他甚至还设法看见了一只在灌木丛上空翱翔的鹰。
光在一个薄雾笼罩的黎明到达稍稍接近边境的多伦多，地上有霜，宽阔的市区街道很安静。尽管还很早，光却不愿等待，立刻就在附近电话亭给同学打了个电话。他们在一起度过了美好的时光。
16.A Woman Doctor-Lina
女医生丽娜
Born in a pigs’ nest, Lina led a poor life in her childhood. She was looked down upon by the children of her generation. But she intended to become a doctor after she came across Lin Qiaozhi by chance, who was delivering medical courses to an audience crowding around her. Before moving off, Lin inspired her to carry on her study. With