郭沫若说：“春秋末年以来，蓬蓬勃勃的自由思索的那种精神，事实上因此而遭受了一次致命的打击。”“致命的打击”缘于（   ）

下列各组共点力分别作用在一个物体上，有可能使物体达到平衡状态的是（   ）

   The Blacks are English . Now they are in Beijing . This is their first visit to China.
   They are going to stay in China for three weeks . They want to learn some Chinese ,too.
   He likes driving in Beijing very much .Mrs Blacks is a teacher .She often visits a middle school in Beijing ,and she likes to speak with students.
They take a lot of photos in China .When they are back to English ,They’re going to show the photos to their friends. They want the English People to know more about China.