下列能够遗传的变异是（  ）

①狗的不同毛色

②红绿色盲

③皮肤白化

④先天愚型

⑤无籽西瓜

⑥同品种、同质量的白菜种子，由于水肥条件不同，植株个头的大小不同．

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.