最初，人类通过眼睛来观测天相。之后，有了光学望远镜，我们能直接看到更远的星体，看的也更清楚。再后来，我们又有了射电望远镜，我们通过观测电磁波来研究我们根本看不见、远在亿万光年以外的宇宙。现在，我们或将掌握另外一种探索宇宙的全新工具——引力波。通过研究引力波，我们可以研究电磁波无法直接观测到的黑洞，以及占了宇宙质量95.1%的暗物质和暗能量。这表明（  ）

①认识的发展与认识工具的进步没有必然关系

②获取真理性认识是探索宇宙的目的和归宿

③世界上没有不可认识的事物，只有尚未被认识的事物

④实践具有社会历史性，认识在实践的基础上不断深化和向前推移

根据短文，从A、B、C、D四个选项中选择正确答案填空。

    Mike is nine this year, but he's 1 in Grade One. He's tall in his class and his 2 is in the last row(排). Miss King usually wears 3 and can't see what the boy does there when she's near the blackboard. Sometimes Miss King asks him some 4. He stands up but doesn't know what she 5. Miss King often phones his father. The man is very busy. He 6 his wife to help Mike, but she doesn't know 7 and can't do that. She can only make him do his homework at home after supper. And she tells the boy she will buy a nice bike for him if he makes 8 in the exam(考试).

    This afternoon Mike 9 happily. When he sees his mother, he says, “I make a hundred this time.” “What?” says the woman, “What do you make it in?”“I make 10 in reading, forty in spelling and twenty in Maths.”