读图完成下列题。
图中A、C、D、E、F各点中，与B点自转线速度和角速度都相同的有（）
A．4个
B．3个
C．2个
D．1个
参考答案：D
Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security Summit in Washington, April,12,2010.
A．witnessed
B．were witnessed
C．had witnessed
D．have witnessed
下列语句中加粗的词，解释不正确的一项是 [ ]
A．有，名万物之母／母：根本。
B．玄之又玄，众妙之门／妙：奥妙。
C．此三者，以为文不足／文：掩饰。
D．见素抱朴，少私寡欲／抱：持守。
