【简答题】Translate the following paragraphs into Chinese. The primary drawbacks to the magnetic and acoustic approaches are the need for external guidance—which is cumbersome—and the fact that magnetic fields ...
【简答题】Reading Comprehension Each of the following passages is followed by some questions or unfinished statements. For each of them, there are four choices marked A,B,C and D. Read the following carefully a...
【简答题】Doves flying in daylight use the sun for guidance. But the stars are obviously their most important means of navigation. They find their way by such landmarks as mountains ranges, coastlines, and rive...