以下对高等动物减数分裂以及受精作用的描述，正确的是（    ）

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
    The Internet is an amazing information resource. Students, teachers, and researchers use it as ____ investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the____ (late) medical development. Ordinary people use it for shopping, banking, bill-paying, and communicating with family and friends. People all over the world use it to connect with individuals from____ countries and cultures. However, ____ there are many positive developments____ (associate) with the Internet, there are also certain fears and concerns.  ____ concern relates to a lack of control over____ appears on the Internet. With television and radio there are editors to check the accuracy or appropriateness of the content of programs, and with television there are____ (restrict) on what kinds of programs can ____ (broadcast) and at what times of the day. With the Internet, parents cannot check a published guide to determine what is suitable____ their children to see.

成年人大量出血后，下列哪种结构可能恢复造血功能（　　）

直接选举、间接选举、等额选举、差额选举是公民参与民主选举的方式，采取什么样的选举方式，要根据以下条件来确定（   ）
① 社会经济制度　  ② 物质生活条件　  ③选民的文化水平   ④ 选民的意愿

在下面的横线上填写处相应的句子。

①公然抱茅入竹去，____，____。

②____，____，故不为苟得也。

③在白居易的《钱塘湖春行》一诗中，描写钱塘湖早春花草景色的句子是：____，____。