( )
A:People can cook with it.
B:People can take photos with it.
C:People can tell the time with it.
下列有关原子的说法正确的是( )
******在十七大报告中指出:“新时期最鲜明的特点是改革开放。…从沿海到沿江沿边,从东部到中西部,对外开放的大门毅然决然地打开了。”我国的对外开放开始于( )