A:You should take a deep breath.
B:What's wrong?
C:Don't worry about it.
________ Tom ________ Mary speaks good Chinese, so they can communicate with these Chinese students very well.
马克思说:“哲学家并不像蘑菇那样是从地里冒出来的,他们是自己的时代、自己的人民的产物,人民的最美好、最珍贵、最隐蔽的精髓都汇集在哲学思想里。”这说明( )