马克思主义哲学以一种批判的态度对人与世界现实关系作出评价。要改变世界，就必须对现存世界持批判的态度，在对现实的批判中确立作为现实之否定形态的理想，再通过实践把理想转变为新的现实。由材料可知，马克思主义哲学（    ）

①具有革命性

②具有科学性

③能为人们提供认识和改造世界的工具

④是变革社会的巨大物质力量

受精卵的形成和胚胎发育的主要场所是（    ）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改仅限一词。

2）只允许修改10处，多者（从第11处起）不计分。

    All of us need friendship. An understanding between two friends mean both of them have similar ideas and trusting each other. Otherwise, it is impossible for him to help each other and to make their friendship to last long. As an old saying goes, “A friend in need is a friend indeed.” So really friendship should able to stand all sorts of tests. And it is wise to have as many good friends that we can. The more friends we have, the more we can learn for one another, but the more pleasure we can share together.