阅读下面的短文，掌握其大意，然后从短文后各题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳答案。

The word “duang” is 1 new that it does not even appear in the dictionary. But it has already 2 rapidly across China. It has caused 312,000 discussions 3 15,000 users. On Baidu， which is the 4 online search engine in China， it has been 5almost 600,000 times. It has been noticed in the West， too. Foreign Policy， a news Website， regarded it 6 a big event.

But what does it mean？ It seems to be an example of onomatopoeia(拟声词). It was started by Hong Kong action star Jackie Chan. He acted in an advertisement in 2004.In it， he said his hair was bright and black 7 the word “duang”. The word appeared again recently after Chan put 8 on his Weibo page. 9 users then began to surf Chan's Weibo page and made comments(评论).

The word appears to have many different 10， and there's no perfect translation for it. But you can use it as an adjective to give emphasis(强调)to the word that follows it.

“耒”是传说中神农发明的农具，人们约定俗成地将“耒”作为与农具有关的字的部首。常见的有“耕”(用犁松土)、“耘”(田地除草)、“耦”(两人或两牛并耕)、“耧”(播种工具)等等。通过这些汉字可以了解古代中国的（    ）

勾股定理是几何中的一个重要定理．在我国古算书《周髀算经》中就有“若勾三，股四，则弦五”的记载．如图1是由边长相等的小正方形和直角三角形构成的，可以用其面积关系验证勾股定理．图2是由图1放入矩形内得到的，∠BAC=90°，AB=3，AC=4，点D，E，F，G，H，I都在矩形KLMJ的边上，则矩形KLMJ的面积为（   ）

$\begin{array}{ccc}{a}_{11}& a_{12}& a_{13}\\ a_{21}& a_{22}& a{}_{23}{}^{}\\ a_{31}& a_{32}& a_{33}\end{array}$