My family is ____(计划) a journey to China in the winter. Our first ____(选择) is to visit Beijing, one of the____(大) places in the world.. So we need to ____(预订) the plane tickets. To tell you the truth, we like going by train____ (好) . But we think it is too slow and it ____(花费) much time. Though going by plane is more____(昂贵的)，it goes____(快) and saves time. Some people may think it's not ____(安全) , but our family all____(赞同)it's our favorite way to travel.

下列各项中能正确表示正常男性精子中染色体组成的是(    )

在如图所示的电路中，当开关S断开时，螺线管中小磁针的N极的指向如图所示（水平向右）．当开关S闭合，小磁针经扰动后静止时，N极的指向为（　　）

有学者研究发现，自18世纪初开始，法国出版的神学书籍下降，科学奇事、世俗文化和艺术书籍比重日增，各种传统形式的文学书籍维持不变。这反映了当时法国（  ）