此类题目，要求学生在通篇理解文章的基础上，依据文章提供的事实，将各种信息加以分析，从而得出正确的结论，切不可站在自己的立场上凭空臆断。
●难点磁场
1.(★★★★★)In July 2010 Jupiter, the largest planet in our solar system, was struck by 21 pieces of comet(彗星). When the fragments(碎片)landed in the southern part of the giant planet, the explosions were watched by scientists here on earth. But what if our own planet was hit by a comet?
