题目

 任务型阅读   阅读短文，按照要求完成各题。（5分） At the moment, it may be difficult to imagine, but many people believe that, by the year 2100, we will live on the planet Mars. Our own planet, Earth, is becoming more and more crowded and polluted. Luckily, we can start again and build a better world on Mars.         First of all, transport should be much better. At present, our spaceships are too slow to carry large numbers of people to Mars—it takes months. However, by 2100, spaceship can travel at half the speed of light. It might take us two or thr2．某同学用螺旋测微器测量一金属丝的直径，测微器的示数如图所示，该金属丝直径的测量值为1.682 mm．